86 SVO bucking and hopping

I just got my old SVO back but it has a small problem. It runs like crap, it will start and run for about two seconds then die. Once it gets warm it will idle but not smooth. You can rev it up in neutral and it does just fine. When you get it on the road it will do ok until the turbo starts to build or it starts to get under load, the car starts to miss real bad, shift gears and same thing.
The things that my buddy did to fix problem: rebuilt dizzy, replaced idle air motor, replaced tps, replaced plugs, rotor, cap, wires, replaced coolant sensor.
I myself checked the timing belt, the timing is at 10, unplugged knock sensor, TPS is at .94vdc.
Before I start throwing parts and time at this thing I sure could use some advice and direction.
 
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I did some research on it today. It is potentiometer(variable resistor). They put 5vdc on one side of it and the more the door opens, the more of that 5vdc the pot will let through to the computer to give it a number to put to the amont of air going through. Any other ideas of what it may be.
 
also inspect the wires and the connection going to the IAB..common to deteriorate..also try removing the IAB and cleaning it..thats what i did on mine and it started the first time and ran perfect with no bucking
 

He means IAC - Idle Air Control

This is the silver device attached to the throttle body.

Sounds like you need to do a complete tune up - plug (correct gap), wires, etc.

Check the Vam hose as well - If the spring inside is gone, the hose will collapse and cause lack of power.

What did you do to the VAM to make it work better?
 
Did a complete tune up, that all was in first post. I put a meter on the VAM and noticed that the wiper on the pot would jump from 90ohms to 260ohms in one small space. I just bought a new one, BAM, problem almost solved. I have it torn down right now fixing some other stuff I found that probably was the other little bit of issue.