Engine rebuit. Idle has Heavy putt-putting,
You may have the mechanical timing (ie, timing belt) off by a tooth. The engine will run that way, but not all that efficiently. That'd be my first suspicion. To fix it, it'll have to be torn down to where the timing belt is visible, as are the cam and crank sprockets and oil pump housing. Then the timing marks can be aligned to see if they all line up as they should.
TIMING IS COMPUTER CONTROLLED AND NOT ADJUSTABLE WITHOUT SPECIAL DEALER LEVEL EQUIP.
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