When you get on it, the motor rocks. If there's a failing connection in the wiring, it can open up, then re-close when you let off and the motor returns to its normal position.i have a 2012 chevy impala lt with about 178,000 miles and since i got it ive been having a issue with code p0641 and it would occur if i gave it full throttle and would pull back if i would drive but then when the engine light goes off its good like nothing happened but recently i noticed my motor mount bracket was broken and i replaced it and the motor mounts and the next day i was driving, stabilitrack turned on and my check engine and also said engine power reduced and as i was driving to a autozone to get a diagnostic it stared to overheat because the radiator fans turned off and as well as my ac and i got the diagnostic and it had alot of codes and i checked if the wring harness was affected but there wasnt any visible damages that i could see myself sadly (p0178,p0056,p0036,p0641,p0443,p2199,p11c2,p0693,p691,p0480,p0102,p0097) i wonder if anyone here would be able to help with suggestions or advice, thank you.
There are a couple grounds attached on the bell housing around 8 and 10 o'clock, as I recall. I would start there and inspect those wires to be sure they don't have any breaks in them. Also, check any wires near the motor mount bracket you replaced. Perhaps that disturbed some of the wiring. That is, perhaps a wire got pulled loose in that area.