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Hi Paul. This sounds like the PCM itself. No codes makes me think that the PCM shut down. If you had a cam or crank sensor code, then I would say replace them. But since you have no codes, go with the PCM.
Well here is what happens: When the PCM shuts down, it's memory gets erased. It has to relearn the idle strategy and if the throttle body is dirty with carbon deposits it reduces air flow at idle and that is why you have to keep your foot on the throttle to keep it running. If you were to clean out the inside of the throttle body with some spray throttle body cleaner, then it will most likely idle on it's own after a PCM shut down. Hope that makes sense!
Sounds good Paul!