engine revs to 3000 rpm while vehicle is stopped

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The engine will increase revs to 3000rpm without reason especially at low speeds or when stopped in traffic or at lights. I can get the revs to drop if I gently apply pressure to the clutch; but if the clutch is fully depressed the engine revs resume to the 3k rpm. The car is also guzzling oil but there is no pooling of oil under the car. The check engine light has not displayed; the idiot lights are functional. Start up is not a problem. Shut down however sounds like a stall out.