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Q:

MISSES AFTER 70 on 1996 Chevrolet Suburban 1500

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BLEW HEAD GASKET SO I HAD THE HEAD REDID,AS WELL AS NEW PLUGS,WIRES,BASIC TUNE UP.NOW I HAVE A SMALL BUCK/MISS ONLY WHEN I PASS 70MPH. IT DOESN'T HAVE A CODE!
(1) Answer
Sounds like a high rpm miss. Take note of the rpm when it starts missing. It could be a bad valve.