Just a thought... Could this be a bad gas issue? I don't use much fuel. A whole tank will last me three weeks since I work very close to where I live. I recently just refilled from the same gas station (an Exxon) I always gas at. So, if there was something wrong with their 93 I'd be running that fuel for a while.

I've got a 6 hour drive coming up so I'll be able to clear this tank pretty quickly and get a new tank in Memphis. Following this train of thought (as I was just resting my head on my desk), I remember my friend commenting that my spark advance was awfully low. Could I be running on my bad_fuel_spark table? If my PCM thinks I have bad gas, I probably do...

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas