Needing help here, as I'm completely stumped. I have a 2000 Grand Prix, that I swapped a Park Ave Ultra L67 into, and now I'm having mega problems. Got a custom time from intense made, albeit for a top swap, but I didn't think it would cause any problems. Ran tests for spark and fuel pressure at the rail, and it passed both. When it doesn't start, it backfires, so I know it's getting fuel. When it does start, it runs like garbage for the first ~3 minutes, then smooths out and purrs like a kitten. Get out onto the highway, and all is fine, until it randomly dies. Typically dies ~5 times on my 25 mile trip to college. Replaced the crank sensor, MAF, did a re-learn, and nothing has helped. Either need this car to run, or I need someone to buy a car with these issues. Open to suggestions.
Originally Posted by BoostedPontiac
