Originally Posted by phunk

Sounds pretty similar to what my car was doing. Assuming it will let you: try what I did... clear the codes out, start the engine with the gas pedal down (dont go up to 7500 or anything, just whatever is required to get it to run), then lower it down very slowly to idle speed... and if it will hold idle let it idle for a minute, then shut it off and wait, turn it back on.

No idea what was going on, or why that fixed it... but thats what I did and then it never acted up or gave me throttle codes again.