times I shut it down then put the ignition to the start position, then unplug the Gray TPS connector for 5 sec or so and replug the connector to reset the brain. Then turn ignition key to off position then restart the car, all back to normal until the next random time. The TPS was replaced some time ago because of this issue but that was not a fix, I just to the work a round noted. Is this world unknown evil electrons at work? ;-)