Hello,
What exactly gets really bad when you put it in gear or A/C is on? Are you getting a shake or something. The A/C probably would show an effect if the problem was a motor mount but the motor may shake a bit more if you have a misfire going on. Is it possible for you to upload a video of what you are talking about. Take the video with the condition before and after the A/C being turned on. Is your engine light on? If so, get it scanned and let us know what if any codes are stored in there.
Tom
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Wednesday, October 14th, 2020 AT 10:28 PM