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I have a 2009 Cobalt LT with an auto transmission, and around 83,000KM.

This is really odd, somewhat random, and occasionally scary. Typically happens on a highway where I'll rev up a little high if I need to. Normally I would do this and the revs would come back down and I can cruise along.

When this happens and it sticks I'll take my foot off the gas and the revs stay at 4,800-5,200 so if I touch the gas pedal it shoots up from there... HARD... Like I just floored it at the top of my gear which is pretty dangerous.

I had my car serviced a week ago, mentioned this issue, but nothing was done about it. The only work done was my request to change a worn timing belt.

What's going on?
 
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