I have a 1986 Chevy C6500 firetruck with a 427 tall deck. After getting up to temperature The truck will randomly turn off and all of the gauges will drop until you switch the ignition to the off position and then back on, the truck will then backfire and the engine restarts. I have replaced the ignition, distributor module, coil, cap and rotor but that has not fixed the problem. The truck is also wired with a battery cutoff switch.

any ideas on this would be greatly appreciated.

 

Hello friends, have you tried to use diagnostic tools to detect what is wrong with your car? I hope I can help you.