I bought this wheeler brand new and it has been a GREAT machine. This past weekend I starting having issues with it not wanting to shift into higher gears, as soon as it got to around 21 mph it would bog down and not want to shift. The manual trans works fine, just not in auto. I checked the fuses, they are ok. Took the connector part off the angle sensor, but didn't take the actual sensor off. Connected it back and ran it up the road. It now shifts but now it jerks when it shifts and it's always been really smooth and seamless shifting. Any ideas...??