I own a 1997 mustang cobra nearly stock with a cold air intake and some 4.10 gears. Recently i had my spark plugs replaced and fuel injectors cleaned. When i started up the car the idle was at 700 but shaking the car. I drove it around a little and every time i pushed in the clutch the idle got higher. Eventually sitting around 2000 rpm everytime i push in the clutch and wont ever drop unless at a stop for about 30 seconds it will drop to 1000 and when i accelerated again the rpms shot back up to 2000 in neutral. The ignition wires check out and there isnt a vacuum leak. I replaced the TPS (throttle position sensor) and IAC valve hoping that would still fix it. Nothing and still have the same problem, Any input appreciated!!!