When first installed my engine would not idle and kept stalling. I took it off and the car ran fine. I replaced my oxygen sensor and the car ran fine so I reinstalled the power chip and I had no idling or stalling issues. Premium fuel is listed, but I have 87 octane gas (6000 ft altitude) and I can't see a ping. I haven't done any high speed time trials and I don't feel any difference in acceleration. I have a 1992 Firebird.
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