It acts like when you have cruse control on and you are going up a slight hill so it automatically pushes the gas to keep you going the correct speed. But only the RPM's increase then go back down. After it does it a few times the check engine light goes on. Then after a couple days the light goes back off.
 
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Ask Your Question2004 Jeep Grand Cherokee
Question: While driving the RPM's will rev up but my speed does not increase.
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