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Full diagnostics are available for a reasonable fee from alldata.com or with an acdelco tds subscription (assuming these are available outside the US).
I think the P2138 is one of the tricky ones that is checking correlation between rising and falling voltages across both the accelerator pedal sensor and the throttle position sensor. And if its an intermittent problem, it will probably be be hard to track down the problem. And next to impossible to track down without something to pull freeze frame data from when the code triggered.
Do you have a throttle commander or similar connected or has the car been "tuned"?
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