96' GMC Sierra random total loss of electrical.
Having an odd problem. Started with Code P0122, Truck was running high RPM'* at highway speed. Normally runs about 1600 at 60mph but was running 25-2600 instead. Replaced the TPS. All was normal for the first day, no new codes. Took it for a long drive down the freeway one day, had the Cruise control set at 75 when the whole electrical suddenly went out and came back. Was quick enough that it didn't kill the engine at speed but was one hell of a jolt. Took it of CC and no more problems the rest of the way. Go to my destination and sat in a parking lot with it idling and it did it again. This time it killed the engine. Started right back up though. I've checked the obvious. Battery cables e.c.t. What the heck could cause it to do this?