GMC Repair: 93 gmc safari 4.3 aceleration, throttle position sensor, gmc safari

Question
I have a 4.3 liter W engine with cmi injection it has problem with aceleration from idle when you give it gas its hesitates and misses its seems like its from 1000 rpm to 2000 rpm range that it is happening at higher rpms it runs steady it idles and starts ok but the idle is a little rough it had a previous problem with not starting which I thought was a clogged fuel injector so I cleaned them it ran great for 2 days good idle and aceleration now it has this problem it shows no fault codes it seems to be staving for fuel or late ignition any idea's I am at a lost I tried a throttle position sensor and a used computor but no help I looked for air leaks but none were found also when the engine is at a high rpm it sometimes has a wandering rpm  

Answer
It could be a weak MAP sensor vacuum line.

Faulty MAP sensor.

Faulty TPS

Faulty USED ECM.

Plus about another dozen possibilities.

QUESTION: WHY would you put a USED COMPUTER into a vehicle when you have absolutely NO IDEA if it is any good or NOT. ?.


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