Stalling Issue

Hey Guys...

So Like a month ago, i swapped out my 2.2L for another 2.2L while Im waiting to finish my new motor. Anyways, The 2.2L i swapped into my truck, Worked great before it went in, Put it in, got everything connected, it was Running a little rough, so i re-did the Timing, Adjusted the Idle, Everything was pretty good for about 2 to 2 1/2 weeks or so... And then i was downtown Saturday night (last week) it started to Act up when i was leaving, Almost like it wasn't getting gas, So i thought i Ran outta gas, so for the hell of it, I tried to crank it like 5 more times to start it, and it actually started, Drove 3/4 of the way home, stopped and got gas, just incase i really was running outta gas, (which i don't think i was)... Now, Since then I can drive down the road fine, but if i let off the gas in gear its almost like it wants to stall out, and if i go into Netural while rolling down the road, it stalls out complete, now sometimes if it doesn't stall out completely it dives to like 250-500rpm's and toggles between the 2, I've attempted to adjust the Idle, and adjust the Distributor every so slightly to compensate for the lack of idle or viceversa, keep in mind the the distributor is as close to center as can be, its not retarded or advanced to much, either way, i dont find it helps me with my issue.

I find i can make it Idle pretty good at approx 800-900rpm's... and even 1000rpms, to compensate for my compressor when it drops my idle. and just when i think everythings good and it sounds good, I drive away, and i don't even have to be going fast at all, and the Idle will drop really low and sometimes even stall, if i let off the gas with the clutch in, happens really at any speed.

No Problems with accelleration really that i've noticed.

All vacumm lines are connected

Things i've changed:

Fuel Pump (Mechanical)
Fuel Filter
Pulled the top of the Carb off, and cleaned everything
Cleaned Gas Lines
Pulled Fuel sending unit, Noticed the Mesh filter wasn't on it, put it back on PROPERLY...
Spark Plugs

Is there a possibility, my distributor, is not advancing?

or to much fuel put a fuel pres. reg. on it set it around 4 psi

It kind of sounds like a choke issues to me. Check to make sure the choke is working right. Other then that, I would almost think that it is carb icing. Do you have a hose connected to the intake assembly from the exhaust manifold?

I'll check the choke when i get home... Im pretty sure its working correctly.

And no, i don't have the Hose connected from the Manifold to the Intake... I had it Unplugged forever on my other motor after i put my header on, But now that this' a different motor, i left the Stock Exhaust manifold on it.

SOMEONE HELP!!!!

Well Chokes working correctly from what i could tell, so i thought i'd swap out my EGR valve for the hell of it, Before i did though, i was taking the EGR off the other motor, and noticed 2 vacumm line connections under the intake manifold, so i checked on my truck and 1 of those 2 vacumm lines on the bottom of the intake manifold were disconnected, so i reconnected it, and pulled the terminals off for approx 5mins or more, and then reconnected them, and started it up, adjusted the idle accordingly, and took it down the road, BAM.... Seems to run better, left it in gear and off the gas, it stayed where it was, kept going and put the clutch in and put it into Neutral, let the clutch out, and coasted, NO STALL ...

Its still acting up slightly, but it doesn't stall now when i let off the gas, this could possibly be the issue? vacumm line assiocated :@ Damn Truck... Just run fine for me already!

those two vacume lines sukk azz mine are always comming loose

Does it change the way your truck runs? if they come off...