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Q: rpm vary in 3 and 4 gear with out applying any more gas on 1997 Pontiac Grand Prix GTP

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when cruising 50 mph or 60 if i give it some gas the rpm's go up and then slowly come back down before it starts to gain any mph is that transmission slipping or what
(1) Answer
Normal for the rpm to go up when you accelerate this unlocks torque converter and the engine rpm goes up to maintain mph. for this is a lower gear.
If it seems to be different than normal let a mechanic take it for a spin.
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