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My 2004 911C4S has a rough idle that makes the car vibrate. Just a slight increase in RPM makes it smoothe out. I've changed spark plugs, fuel filter, air filter, cleaned the injectors and throttle body. Even replaced a worn out transmission mount. Runs great at speed but shakes when idling in stop and go traffic. Seems to worsen the longer I'm running the car at any one time. CEL is not on. Could this be an MAF problem even though I have no CEL alarm? What suggestions do you have?
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