Flashing wait to start light- truck shuts off and will not restart until wait to start light comes back on. Is random, has no warning, no pattern to problem, only does it every few days. Truck also develops a very mild skip just prior to truck shutting off. After truck starts, skip doesn't seem to be present until problem occurs again. I have replaced the following: Crankshaft sensor, IDM Module, PCM, fuel pump, fuel heater, ignition switch, removed and cleaned all known or visible grounds, changed type of oil from delo 15w40 to shell rotella 15w40. I am completely at a loss as to what is causing this problem. Can you help? Thanks

 

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