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The RPMs on my car go up but the speed moves slowly but it doesn’t happen all the time. I have had the intake valve change twice and some other work done to it and they still can’t figure out the problem

Hi Sara, It most likely means that your clutch is slipping. It means when your clutch is engaging and disengaging and no power is delivered to the wheels and as a result, the car will not move forward. In other words the revs will increase without the car accelerating. The clutch will fail due to the wear and tear and also from driving habits and driving conditions.