I just bought an 81 B150. The guy put new plugs and wires, cap and rotor on, did basic service. Will turn over but not start. Put gas in the carb, but nothing..... thinking it's the ballast resistor, but can't find it.... what do you gents and ladies think is the issue? Got spark from distributor and coil, and if it was a fuel issue, it should start with a bit of gas down the throat of the carb.