1996 Chevrolet Suburban 1500 Q&A

1996 Chevrolet Suburban 1500 Question: MISSES AFTER 70

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! -
Answer 1
Sounds like a high rpm miss. Take note of the rpm when it starts missing. It could be a bad valve. -
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A rebuilt transmission was put in last year. Also put on new tires. What is the most likely culprit? Out of balance tires? U Joints? Something else I'm missing? Thanks