I replaced the major coil. Just found out there is a separate pickup coil in the distributor I have not replaced yet. If that was bad would that cause the truck to fire just as you let of the key? ____________________________________________________
There is a wire from a terminal on the starter relay to the (+) terminal on the ignition coil. This wire supplies current to the coil while the relay is energized during starting.
If this wire is missing or broken, or if the relay is not making its connection, the engine will not start during cranking, but may fire when the key is released to the RUN position.
Check the voltage on the coil (+) terminal during cranking. If it is more than 9 volts, the relay and the connections are okay. If not, check the voltage at the relay terminal during cranking. If it is more than 9 volts, the wire is broken. If not, the relay is defective.
Good luck.
Rodan.