It's not just a GM thing. I've had an issue with the Cobra lately where at full throttle and high rpm the engine cuts back to idle. It was just happening occasionally had then it got to where everytime I go full throttle between 5400-5800 rpms it will cut out. Yesterday after driving it to the store the idle decided to just to 2200 rpms. There are no vacuum leaks and the the IAC isn't stuck open. This is why I like a carb!
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