Mine has me a bit befuddled. I love the car, it's immaculate and is just a great looking car. A couple weeks ago, I noticed a rough idle for about 5 minutes after which the ECM does something to adjust and it smooths out and the service soon light goes on. No problem, hook up the old code reader and see what's what. No codes. Even when the idle is rough, it's not all that bad, just a little noticeable.
It almost acts like the ECM is adjusting for a lean condition, guess I'll start with the oxygen sensors.
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