I was installing gauges in my 81 c10 305. I removed the distributor cap marked the position. removed the distributor so i would have some room to install the fitting for the oil pressure gauge. Installed it the truck crunk up but it is misfiring. Now it wont start at all and blows sparks out of the carb. The distributor was put back in just like i took it out. The wires are in the right order. the wiring harnesses are plugged back into the distributor. I KNOW I read something somewhere about issues cranking when the 2 wire harness from the oil pressure switch was unplugged. maybe im wrong. It seems like I read when that harness is unhooked is causes some issue with the wire going to the electronic choke. I looked at a wiring diagram and i believe the truck has the electronic spark control module.