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Last week I woke up to -4 degrees, started my car and had a check engine light. Onstar did a diagnostic and told me there were 3 codes. Engine Misfire, Exhaust and Low Power. I didn't get the numbers but I took it to the dealer. They didn't/couldn't say what happened but had to re-program the ECM. My mileage for the last six months has been poor. 16 in the city and 26 highway. I was thinking I may as well be driving an 8. Well, after the shop visit, power seemed to improve. Mileage on a highway trip yesterday got up to 31.1 @ around 70 avg. mph. It is still unforgiving to any quick acceleration or stops for coffee. Anyone else experience this?
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