LPG Impco carb sitting on a fly by wire throttle body (governor) and Woodward Regulator. The engine will only start if I disconnect the 4 wire connector from the distributor and install the jumper for timing adjustment. I usually pride myself as NOT being a "parts changer", but this thing is killing me. I have tried an OE module, ECU, MAP, and all circuits check out OK. Any help would be appreciated!