Hello everyone i have a cat 2c4000 that has me going nuts. I recently done a transmission seal and after putting the engine back in found propane bypassing out the intake. I changed the vaporizer but problem persisted. I checked the sensor on the throttle body and the plunger was stuck so I cleaned it up and she ran for about 15 minutes no problem. After that again with the propane bypassing. Purchased a new sensor and installed no change. So now I've changed the fuel cutoff, the injector and on vaporizer #3. I've also tried changing propane tanks just for the off chance there was a problem with the tank causing it. Any ideas would be hugely helpful