Good morning,
I have what seems to be a misfire, but it’s more of a grumble/vibration but only in gear (but most noticeable under 20 mph) but is in accordance with engine cycle/rpms like as it shifts it gets quieter but I can “feel” the sound vibration if I hold my hand over the exhaust. The only mechanical thing that’s been done was changing the compressor and it seems like it started the next morning after.

 

any trouble codes?

 

No codes. But is a motor mount possible?
if the engine is out a little bit after warming up and the rubber heats up to tolerate vibrations better?