when riding today, i noticed that the transmission was making alot of noise when it was shifting between 2wd and 4wd. there was a connector by the unit making the noise so i disconnected it to see if it would stop making noise. it didnt. it actually created a new problem. it now wont go over 12 mph and backfires once you try to go faster. i plugged that connector back up and still doing the same thing. i disconnected the battery and still does it. any ideas on how fix my F*&% up?