The check engine light was on, which is misfiring in cylinders, but it turned off by itself. Then I went to dealership, they provided a report, but I refused to repair there. I think they deleted the code history, and I cant find it now. However, the engine rpm is unstable, while both driving and idling. Can you inspect why the rpm is unstable, and check whether it is still misfiring?
My car has 38000 miles.
My car has a manual transmission.
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