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At high speeds rpm's will not decerase when i let the foot off the pedal at high speeds?

Hello, I have an automatic 1998 Trans AM. At high speeds sometimes my car's rpm's will not decrease when I let off the throttle. This can happen if I am on the expressway and increase to like 65mph and then wish to coast. I let my foot off the gas and the rpm's will not lower to like 1k rpm; instead they will stay at 3k rpm or 2.5k rpm unless I hit the brakes.

Is there something wrong with my transmission or even my engine?
Is this something with the idle or perhaps my tranny.

Note: I have an auto tranny, but it has a boot cover over it. I guess the person before me put this in. I think the gear pattern form top to bottom is Park, Reverse, Neutral, and then there are two drives.

Hope this helps...