Could someone tell me what could be causing the high idle problem.When I first start the car up,everything is fine.Once I give it gas the idle rises and falls.It goes as high as 2 grand and may come down to 1000, which is still to high.I changed the plugs ,air filter,Fuel filter,Cap and rotor and still the problem persists. I sprayed carb cleaner around the intake manifold to check for leaks and there was no change in the idle while doing this.Is there some kind of sensor that could be causing this.Any help would be appreciated.

Thanks
Mike Bittner
91 190e
96 C280
94 Range rover
69 camaro