I fixed it. It WAS the PE base AF table like I originally thought. On a whim I reset it back to stock and it's just fine with no other changes. Guess I'll tweak it a bit rich, but not that rich.

It was nothing more than a hunch. The really rich exhaust was a clue.

Anyone got any more input on how that table SHOULD be set? No offense to WebRacin', but that wasn't working for me.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas