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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.
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