More information needed here I think so just some guesswork follows. If a hot engine is left idling after a run,the temperature guage will rise due to heat rising from all the hot components and no ram air through the engine compartment,the electric fan will cut in and out(is this the "revving"you hear). If your engine is running hot when driving along,it is most likely the thermostat is stuck in closed position,this needs rapid attention or engine damage can result.Check coolant level when cold and if you have to drive it,keep the heater set hot to increase the amount of coolant in circulation.
you have to turn the idle screw down ?? ? ? ? ? ? ? ? ? ? there are 2 of them. one on the right and one on the left. the left one is general idle and the one on the right is for air-conditioning idle and high power output idle ( rev higher ) A vacuum line may have come off if it has started revving.
your sunfire is revving if the idle is set to high, or when adjusted. the idle is high also when the engine needs to warm up in cold weather. there is also the possibility that the engine temp sensor needs to be replaced, for it is not relaying proper heat temp. the light on your dash may show you engine temp, check this. if unable to do this yourself, you may need your cars manual.
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