This usually occurs when the ecu sees a difference between the commanded position ( throttle pedal position ) and the actual position of the throttle body, or a complete loss of signal from either one. I'm surprised you don't have a TAC fault of some sort. Is it possible the codes have been turned off?
My car did this intermittently, I found if the secondary safety latch on the throttle pedal plug was not locked in it would periodically loose the signal, ever since I pushed that in on the plug I haven't had a problem. I would suspect either the throttle pedal, throttle body, or wiring.
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