i had all my motor mounts replaced and 2 trans mounts. but in drive ONLY and ONLY at idle there is a VERY bad vibration what the heck could it be??
My car has an automatic transmission.
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Hello. Most of the time if the mounts are new and it still runs like this it is because you either have a vacuum leak or the idle is too low. A dirty throttle body or a failing idle control valve will cause this to occur. I would check these first. It can also be a failing valve seat inside of the engine so the compression may need to be checked also. If you are looking to have this problem looked at, consider YourMechanic, as a certified mechanic can come to you to [diagnose why it idles rough] https://www.yourmechanic.com/services/car-idle-is-rough-inspection
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