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no, it's telling you exactly what you already know, that the motor runs roughly at idle, which is why you wanted to raise the idle, which happened coincidentally to doing the valve cover, which involves removing a bunch of vacuum lines, that are probably now leaking and causing your rough idle.
Does that adequately surmise your situation?
The root cause of all of this is something that happened when the valve cover was serviced. Your car most likely has a vacuum leak.
Everything that you've seen, felt or heard since that point is likely related to the exact same issue. There is no software or coding solution. Your car has a mechanical issue.
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