MISSES AFTER 70 on 1996 Chevrolet Suburban 1500

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.