u/blonde_and_broken

I have a 2009 CC Precedent with the old GE motor. It stared running slow so I put in a new speed sensor. Ran ok for about 5 minutes and then started bucking. Got a new MCOR, installed it and went on a test run. Ran fine until I heard a small thud and then it started bucking again. Anyone have any idea if it’s an overall electrical issue or maybe just bad parts I purchased (off Amazon)? Batteries are in good shape, three are less than a year old, and before these issues I had a speed magnet on it that would really make that thing move. Especially downhill.