I have a 2007 LTR 450, the fuel system and engine are both good. Injector spits right amount of fuel and has good pressure. Valves are set to spec and piston and rings were just done. Engine is sound. Only mods on it is a sparks exhaust system. It runs horribly cracks and backfires with 1 foot flames out the pipe. Bogs out when given throttle fast. Only thing that I think it might be now is the TPS sensor is bad. Reading is 0.90 volts at the lowest spot i can get it, which isn't in spec. Wasn't running good before the rebuild either. Now I know I may have diagnosed the issue. Just want to make sure that it's nothing else before I purchase one.