93 B2600i 4x4 odd running

[drbigpik@sbcglobal.net]

My 93 b2600i has problems. When driving it looses power at more then 50% throttle. there is no pattern to it. It comes and goes. I have a fresh tune up and fuel filter. I checked the ecm and saw no evidence of damage though the ecm has reaman numbers on it. originally it started when the fuel level was low but now it happens with a full tank. Any help at all would be great. Thank you all in advance. it hasnt ever stopped running but it will stumble until i back off the pedal then it comes back to life. if i ease into it slowly, it wont stumble either. I have a new catalytic converter as well. I have cleaned the throttle body and the maf sensor with the correct cleaners. Could this be a iac or tps issue or am i just screwed. Thanks again

[Tyranitar]

Its probably a computer problem. Who did the reman on it? There is only one company I know of that remans these properly, everyone elses repairs fail again. The way it behaves sounds like it starts stumbling when it switches from closed loop (light throttle) to open loop (WOT). It might be that the WOT circuits are damaged.