Just bought my comp g. Had a bad motor. Two pistons where chipped off. Got a donor motor, installed it no issues idling at all. I've got a tech2 at work (this was happening before as well) updated the pcm to address some issues known by gm.
Went to do a crank learn it it will rev up to 3k if I do it gradually. If I do it quick or (if I'm just trying to accelerate while driving moderately) as soon as it starts producing boost it hesitates. Almost like I hear the sound of air coming out of the air filter.. little bit of sc whine then it hesitates... I don't want to push it because something isn't right. I'm starting to think the c.c. is clogged and thus maybe the reason the old motor gernaded.. It looks untouched at 139k miles. Anyone have any other ideas? I'm just going to have a straight pipe put in delete the cat and resonator tomorrow just figured I'd see whos had experience with a scenario like this.
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