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sounds like an old flash to me with potentially an exhaust issue.
if its idling, its not a vacuum leak.
if its not warm or left for at least 30 seconds after start, it'll go rich if you tap it and bog down, if it does it after its warm/30 seconds , leak.
the acceleration enrichment might have been adjusted on later flashes, i can't recall off hand.
the exhaust leaks could potentially affect it, depending on how much of a leak it is, if it alters the mix at the primary o2 it'll be off.
if you have access to an obd ii reader that can read the firmware id or CVN ( 4 digit number) i can tell you if its an old firmware and you need to update it, or the dealer obviously can.
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