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Hmmm. I don’t think I have seen a problem like that before. First thought that comes to mind is heat somehow is affecting that throttle body from opening smoothly. But then I would think it would throw a code for a TPS or some code saying the pedal sensor isn’t corresponding right with the throttle body.
Come to think of it. I had an Iroc that did something similar intermittently. It would throw a code and once I put a multimeter on the ecm I found the ecm to be defective. What that car was doing was not allowing the timing to advance then it would advance then it would stop advancing causing a weird surge. I do not remember it being as pronounced as your problem. And again my problem threw a code for a timing issue. Yours should be setting some sort of trouble code.
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