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Hey guys I just cant seem to find the solution to my problem. I have a 2006 colorado that had a 3.5 in it that I have swaped to a 5.3 I did the harness my self as well as the exhaust and other misc stuff. The 5.3 is. 99 as well as the pcm that I had programmed, I have a couple issues but the biggest is function asthe truck runs and drives but falls flat on its face at wot or basically anything above 1/4 throttle while driving. When I first got it running last year it had the stock colorado pump and ran ok, then the pump fryed switched to a 255lph pump and runs the same thought maybe it was a tuning problem and had .y spare pc. Tuned by a different place with a completely stock tune minus vats and basic emmisions and still no change
Iv been fighting with this for a year and any help would be great
Iv been fighting with this for a year and any help would be great