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Could be one or both O2 sensors going, or the ECT sensor is out of range. Sounds like something that only has to do with closed loop operation. Kinda taking shots in the dark.

Oh, just one other tip. When you start your car, only let it idle until oil pressure comes up and holds steady, then take off. Cold idling causes the most wear on your engine. Its better to drive gently until its warmed up.
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