The way to know if its your fuel would be first to put a gauge on it, tape it to the windshield, and drive it...watch for a drop in fuel pressure when your "miss" occurs. second, a datalog at high RPM couldnt hurt...you would be able to see injector pulse width and see if they are static at your "miss" and beyond. If you have means of doing so, let me know and I'll dig up the formula for injector duty cycle for you.
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87 iroc with the usual go fast stuff
heavier than your half ton.
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