Will not run under 2000 RPM's

Thanks for the reply.

I am able to keep him running when spraying a mist down the carburetor. It does try to die as soon as that spray is used up. Doesn't seem like there is any fuel going down the venturi during this either. (Other than my spray)

Just some extra info, I also have a new OEM style fuel tank, sender and pump installed (since this seems to lend itself to being a fuel problem). The only things I haven't replaced fuel-wise are the hard lines along the frame, and the rollover valve (ports plugged off for now)

I did manage to find that by unhooking the PCV and plugging it, I am able to hold at 1500 now, but still can't go lower consistently. Going to get a new hose to route since the old one is a little old.

That doesn't sound that bad.

I was just beginning to think that maybe I messed something up/set something wrong (Never tuned a carburetor before).

I got the PCV hooked back up with a new hose. It still has the elbow on the one end and I've made sure the valve up front still works.

Just looking over the intake, I can see no visible cracks/holes (doesn't mean there's not any hairline I suppose, plus I couldn't see the bottom).

I have looked all over the carburetor, to find no open vacuum ports. Only things attached are choke pull off, distributor advance, PCV, and bowl vent. All of these are direct connections, going nowhere else. Only suspect area I found here was an old cap on a manifold vacuum source. One of the big ports. I plan to put a new vinyl plug on this just to rule out any leaks it may have due to age.

I suppose I can't really rule out a bad gasket. I did do the carburetor cleaner test while it was running (spraying it at all mating areas/gaskets) and I never heard any increase in rpm, but then again, I was running it at about 2,000 rpm when I did this (does it pull more or less vacuum at higher rpm's or even matter?) So I'm not sure if this even did anything.

As to everything else,

I have never removed the distributor (not experienced enough with timing to even try that without help).

Fuel pump test gave me plenty of volume when tested, but then again, I can't keep it running at low rpm. Test was done at high idle rpm (about 1800) and I got close to a quart in 30 seconds.

Just went out and got all the tools you mentioned so no problem there.

Only other thing I did was pull the low speed/idle jet in the carburetor and cleaned it to guarantee it was clear.

Unfortunately, I can't find a lot of info on this carburetor because it is a feedback YFA so there is no mixture screw on the outside. So it's very possible I have something set wrong in the low speed circuit causing this, but then again I could be totally off target here.

Before I go mess something up (I suppose neither of us want that).

My carburetor does not have an external mixture screw. No mix screw at all that I know of.

I read somewhere that on this specific carburetor, the mix adjustment is done on the metering rod due to the feedback solenoid on the side being what adjusts the mixture (do you know if this is correct?)

I'm almost sure that this solenoid/stepper motor/bane of my existence is no longer working.

Is there a way around this? I have been researching how the idle circuit works, and my thought is that something is blocked along the line (duh). Is it possible the metering rod is too far in? Or maybe there is an actual mix screw that I'm not finding.

Update:

Replaced gasket on mix solenoid. Was pretty old and starting to fall apart.

Sprayed carburetor cleaner in all passages I could find just to try and get them as clear as possible.

Went and checked metering rod adjustment again to ensure correct setting. I had it way lean. Set it again to spec and now he's able to idle down close to 500, but it seems to just chug there, not really running well. (Lots of smoke out of exhaust, tons of vibration through the vehicle)

Now, I'm no expert, but I'd assume this would mean it's too rich? Should I give it a half turn back where it came from?

There's no good way to adjust with Jeep on, so this may be a trial and error type of issue.

Interesting things happening.

I found that after doing what I did previously, I forgot to plug back in the choke pull off.

So with no choke, and a big vacuum leak, it stumbled for idle around 500-600 rpm. As soon as I plug the choke back in, it won't idle at all. Sits at around 1000 for a while, then gives up.

I'm assuming this is the rich mixture (it's super rich now from looking at the plugs), but it's making it so I can't even check the timing.

I'm assuming I need more air in, but at the same time less fuel? (Definition of rich, I know)

Oh, and without pulling the carburetor off the intake (bigger ordeal that it should) my best measurement for mounting distance is 3".

Update again:

Played around with mixture by setting the metering rod and finally got it to idle consistently (with the choke plugged in to boot).

Now we are averaging an idle at 1,000 rpm's, but it's an average.

It actually likes to go back and forth between 850 and 1,150.

It'll miss for a second, then it'll come right back.

I'm pretty sure I can't check the timing with it bouncing like this.

Sound like a mix problem or an ignition one?

Actually, I messed with it some more today and made some decent progress I think.

I found that there is a plug above the metering rod that can be removed, allowing me to adjust while engine is running.

I also found a write-up on how to disable all the extra emission controls, solenoid included!

I ran a couple wires from the ICM to the distributor, apparently bypassing the computers control over mix and ignition. (Likely had a lot of bad sensors anyway!)

I was able to set the mixture pretty close, and the engine ran pretty decently after this. I couldn't get it to hold right at 950, but I could get it close.

Timing at 1000ish was about 8* BTDC, but according to the write-up, I needed to reset the timing after this. I set it according to the vacuum gauge on the manifolds vac. Interestingly enough, I could only get about 12" of vacuum at 1,000 rpm's max. But if I increased from to 1500, I was pulling about 15-16".

I still think it's a little rich as it sits now, so I'm gonna do just a little here and a little there, trying to get it right, but luckily, it will idle around 950-1,000 rpm's now and I was able to move it under its own power for the first time since it was originally parked!

I'm almost sure that I have a couple vacuum leaks still. Found that the gasket between the float bowl and the air horn has a year in it (likely from my own stupidity) and the one between the carburetor and manifold is starting to separate from itself. Manifold gasket looks a little suspect, but I'm not sure on that yet.