Originally posted by ericingram
the second the pedal hits the floor at any rate, it studders and starts backfiring etc.
Eric,
When I hear you say "backfiring", I have to think that you've got some sort of timing issue. Set the timing to factory spec as Don suggested, and then check out the advance. I'd leave your exhaust change out until last... sounds like that would be money wasted at this time.

Dan J