Loses power over 15 mph

What is that? Wq?

Yes, I checked the timing three times and it's has 165 psi compression across all four cylinders. I used a cigar to check for vacuum leaks and I pulled the O2 sensor to see if that would help but nothing changed. When I try to climb a hill or accelerate to get to highway speeds you can smell the gas like it's running rich. I replaced all the gasket required to do the head.

The replacement head came off of a 1996 Ranger from the looks of them the only difference was where the coil packs mounted to it.

Just the head and cam.

Today I'll get a video and show you guys.

It feels like it's running a little better, but I do not know why.

I have not done anything with the ignition module. I understand they can be expensive and I have vacuum to the fuel regulator but I popped the hood and the regulator looks like it has gas or oil all over it which wasn't there when I swapped heads.

And I'm in Oklahoma and it is a Oklahoma truck. It was bought brand new by my boss and I bought it from him because he didn't have the time to fix it.

I have a 1999 ford ranger xlt with a 2.5L 5 spd. It has me stumped, Its had a full tune up, checked the fuel pressure, replace both coils, timing belt replaced, replaced mass air flow and o2 sensors and reset the computer. Te check engine light is on and the abs light comes on spontaneously. The truck idles and starts fine but when u accelerate it has no power if you make it to 4th while driving you start to loose speed. I need help1

Id first read the codes and then id check the charging system. Then id check the timing belt. They should be replaced at every 60000 miles as a rule. Slack in the timing belt will cause loss of power like youre experiencing but not the abs light. That's why I said to check the charging. It can cause the two lights together if your voltage is dropping just below 12 volts

When you plug it in it does not register. It says. Please connect vehicle.

All of a sudden one day while driving my 1998 Ford Ranger pickup with about 193,000 miles on it, the truck seemed to lose power when going above 55mph. It also began to almost "rumble" when you tried to accelerate. Putting the pedal to the floor you can only get the truck to go about 70mph if you're on a flat surface. Previously you could be driving 85mph and still pass someone with no problems (our speeds here on 75). Oddly, if you slowly accelarate it doesn't seem to rumble, but it will rumble if you start to go up a hill. It has a manual transmission, and pretty much cannot be driven in 5th gear because it has almost no power and rumbles when you hit the gas. However, if you put it in 4th gear you get a lot more power and it acts like it is in 5th gear. However, the rumble is still there when you accelerate. If you're driving on side streets it seems to run just fine. It feels like it's starving for gas to give it more power, but I'm no expert.

I took it in to my mechanic and he replaced the fuel filter, which he said was completely clogged. This didn't seem to help at all. He checked the catalytic converter, and he said that was fine. He also tested a few more things that showed a bunch of different pressures were fine. When he hooked it up to a computer nothing came up. I changed the air filter recently, and on reexamination that seems fine. The truck was running great before this and was previously owned by a mechanic. It seemed like theproblem occurred all-of-a-sudden. My mechanic said he doesn't think the problem will leave me stranded and that it is probably just a "tired engine" but I don't know if I'm willing to accept that answer. Everything else about this truck is great and even with the high mileage I think it has a lot more left.

Two things he suggested were changing the spark plugs (which aren't awful, but also could stand to be replaced) and the u-joints (to get rid of the rumbling, which I'm not as concerned about as just getting the power back). Could the spark plugs be what is causing the lack of power in 5th gear? Since there are 8 spark plugs (on a 4-cylinder) and it's very labor intensive on a Ford Ranger, it is going to be expensive to do that, and this truck is more or less just used to haul light loads of things from time to time. Not something I want to invest a lot of money in, but also enjoy having as a second vehicle.

Could it possibly be the fuel pump? If so, is that an expensive fix and/or worth it on a truck of this age?