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Check Engine light is on.
I filled up my car at a "Gulf" station. After about a quarter of a tank, the "Check Engine" light went on and the mileage came out to something awfull. Next time I refueled at "Amoco" and the light went off. Refueled again at the same "Amoco" and the light is back on. What to do next? Should I take it in to the dealer (or somebody else in the NY/NJ area? Suggestions?) for diagnostics? Any suggestions appreciated.
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