RPM's fluctuate at higher speeds

Condor232

Registered User
I took the car out on the highway today and between about 50-75 mph, the rpm's act very strange. With almost constant pressure on the gas, the RPM's will jump up about 400 rpm, then back down. Then up, then down...etc

It will go up, you can count to almost 2, then they jump back down.

Any ideas? Its a new motor, 4.3L stroker. High stall torque converter and built automatic transmision.
 
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