The way I would approach it, as it is intermittent, would be to plug the scan tool in and go out for a drive...when it does it, hit record...then bring it back, and review your data. The scan tool will record before you push the button...so find your miss, and see what looks f-ed up on the scan tool. That should lead you in the right direction...if you have a scan tool.
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87 iroc with the usual go fast stuff
heavier than your half ton.
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