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4.3 bucking at 4000 rpm no codes

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cdhowell    35

2000 Chevy Blazer 4.3 V6 auto 2WD 174000 miles. Runs strong till 4000 rpm then starts bucking. If I stay in it, it will eventually pull thru and easily climb to 5500 rpm. This is in every gear. No codes at all. No misfires counted in live data. Nothing that looks out of the ordinary in live data. Fuel pressure looks good but can not see or record it while driving. If it was fuel related I do not think it would continue to climb. Same with a plugged cat. Any thoughts? I'm running out of ideas.

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