I HAVE A 2007 F-150 4.6L,HAD DEALERSHIP LOOK AT IT AND COULDN'T FIND ANYTHING. IDLES ROUGH SITTING STILL IN DRIVE.
MY PREVIOUS 2003 4.6L NEVER HAD THIS PROBLEM. I KNOW THEY HAVE REDIGNED THE INTAKE ON THE NEWER MODELS BUT IT SHOULD NOT DO THIS, VERY AGGREVATING.
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That mechanic wasn't lying. I currently own three of them and I know a lot of people that own them and they all have a rough idle. The engines are internally balanced and they don't have dampeners, so you get the engine vibration transferred to the car and that is what you are feeling.
Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.
this could be a case of carbon debris in the throttle body plates and idle air control chambers...simply might just need serviced/cleaned...pull air intake off throttle body and spray with a good throttle body cleaner spray including the idle air ports. Ive also seen motor mounts cause this as this is more of a vibration felt in gear