Vac. Line diagrahm for 1989 GMC C1500 SLE w/350cid?

So, there's no 2nd vacumn line on the solonoid. It's a vent, right?
I'll have to look up the map sensor to see what it looks like on this critter.
Thanks, I've replaced the entire throttle body with a remanuf. One & all it's attached components, I've got a new EGR valve & PVC valve.
Had this problem 2yr ago, & a new throttle position sensor took care of it. But 6mos later it started the same thing again. I changed it out but nothing changed. So, I eventually just changed the entire TB out. But nothing changed. Limited to one hour a day, it's really starting to P-ss me off. Ha!
Again thanks, the 2nd nipple is just a vent & attaches to nothing. Don't have to worry about it anymore.
Rocky J

Ok, I checked the map sensor. I replaced it when I replaced the TB position sensor the 1st time. But, it's worth rechecking!

Ok,
I'm going to just purchase all new vac. Lines.1/8-1/4 & 3/8" & just replace them all. Their all probably the original lines! It's not like the lines cost the same as Gold! I know the EGR to EGR solonoid line just crumbled. Brittle as H-LL.
If, after that, I'm still having the same problem.I'll update you & see where to go from there.
I really appreciate this. I just don't have the energy to just jump in with both feet & spend an entire day checking every Lil thing like I did before.
Rocky J

Ok. Again thanks, I'll check it.

Update:
I've replaced the Throttle Body before our last talk. Today I replaced the EGR, EGR solonoid, spark control module, pcv valve, all vacumn lines, even the one to the Vac. Canister & it still runs alright for several seconds then Boggs down like its cold or running out of gas. Paddle the throttle a little & it'll catch up & run OK again for several seconds then Boggs down again. It finally tried to idle but it'd start to bogg down & like a governor kicking in, it idle up & run Ok for several seconds again then bogg down again. Like it running out of gas or al older carburetor type engine that's cold & the choke isn't working very well.
Outside of fuel pump & fuel filter problems, I'm at a loss. I've got a code reader coming Tuesday PM & hopefully it'll show me something.
In your last note, you said to check the gaskets under the bi? That's the injectors on top of the throttle body. Right. Or did I misunderstand? It's a new "refurbished" TB, but I've had brand new parts that were defective. Especially starters in the 70's. Am I correct about the bi? I haven't checked those. I thoughtid double check on what you meant.
Any ideas?
I'll let ya know what the code reader tells me Tues. Or Wed. I spent 2.5hrs under the hood today & I'm feeling it. Funny thing is, the EGR was very easy to replace, even though the 2 nuts were a Lil awkward to get to. 20mins & I was done with that part.

OK.I understand now. It came thru as bi, not tbi. I put a new gasket under the TBI when I replaced it. There were several to choose from in the set. One was approx. 1/4" thick & black. The others were thin like the original. The thin one was the one I used. But I'll check it again after I check the fuel pressure. I just forgot about the fuel pressure. All the chemo messes with a guys memory recall. I'll blame it on it anyway. It stormed for 3 days here before I got back to it today.
Again thanks

Hey there got same problem. I got 89 gmc replaced throttle sensors put her in shop tried everything think it a vacuum problem?