I just bought a Fuji Imvac 64 EIS engine and I believe I have a grounding problem with my sensor. Everytime that the engine starts up it becomes erratic going from high to low throttle on its own. While pressing the sensor wires with my fingers on the engine block the problem seems to correct itself. As soon as I take away pressure from the sensor wires the problems comes back again. I also decided to get a new sensor and I am having a hard time installing the new one because the bolts hit the crankshaft. Please advise.

Geoff