Quote:
Originally Posted by ajayne85
it doesn't idle 100% smooth but i have heard it was normal for 993s to have an idle that wasn't perfect. if you don't mind me asking how can a non OEM fan belt cause a misfire?
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Because they can slip then catch, slip then catch altering or pulsing the flywheel mass of the entire assembly. Don mentioned all of the known and typical causes.
Non-factory belts and a failing DMF are the two most common.