When I stop at a stop sign or light, I can feel my car vibrating. If I put it in neutral it idles smoothly, but as soon as I put it back in gear it idles roughly.
This vibration you are feeling is a defective motor mount. I recommend you have a mechanic check the engine for excessive movement when putting the vehicle into reverse and drive to see what motor mount is bad. The mechanic should then inspect all mounts for problems or oil contaminations from engine oil leaks.
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