Take the car to a Quality reapir shop ! you are wasting time and money throwing parts at it and guessing whats wrong . ! Have it diagnoised , should cost hour hour and half labor . Scan tool will work on this car ,,but from what I read ,,whoever is working on it has no clue about scan tools or even basic diagnoisis . 1st: Fuel pressure test "with a good gauge " ! whats pressure, does it hold pressure after key is shut off ? If not check fuel regulator .
2nd : hook up scan tool , look at MAP sensor ? Check for vac leaks , sticking egr ? intake leak any codes ?
3rd TAP test on ECM ,they are know for bad boards and solder joints . If car coughs or misses while tapping on ecm ,it's bad,,yes,,even if it's right out of the box !
That will get you close on 75% of the older GM injected cars .
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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