Hello,
It sounds like the shift cable might need adjustment. Over time the cable that controls the selector can stretch or come off the bracket. Which will cause it to act the way you are experiencing.
It will show one gear but be in a different one. Or it might not engage at all.
Inspect the cable and go thru the adjustment process (attached below).
As for the engine shacking it can be various different items. If it has not been tune up in a while it could run a little rough. So a basic tune can can surely improve the idle quality and restore performance.
https://www.2carpros.com/articles/how-to-tune-up-a-car-engine
I have attached both the cable adjustment and replacement procedure.
Please let me know of any questions.
Thank you.
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Wednesday, September 8th, 2021 AT 8:53 AM