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Originally Posted by asmilindog
If the timing belt was the least bit off the engine light would be on. A timing belt does not just randomly skip teeth if the tensioner wheel is laying/resting on the belt and then tightened in that position.
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Really? I can put at least a dozen people in touch with you that will strongly disagree with that little gem!
The timming belt can slip a tooth or two and not trigger the CEL, and they do skip teeth if you neglet to change them about every 70,000km or 5 years, they simply stretch with age and use!
If the rough idle started after you overheated the engine, and cleaning the IAC valve like Ron said dosn't clear things up i'd would be checking the spark plugs and coil packs, but you also could have cooked a senor or two, but these would throw a CEL. Also check the engine vacuum lines you could have a vaccuum leak? And I'd be double checking the timming belt, again, just to be certain!