1992 Cadillac Deville Idol speed control

1992 CADILLAC DEVILLE
4.9L • V8 • FWD • AUTOMATIC
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REARDRIVE
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I put a new idol speed control on when the engine is idling it don't seem to be running to loud but when I come to a stop it seem like the motor is idle up more I screwed the screw on the ISC all the way in but that didn't change a thing and when I am driving I can feel the accelerator study bumping my foot when I turn the car off I can hear tapping noise coming from under the hood how can I fix this problem?
May 19, 2015 at 4:26 AM
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HMAC300
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have a pro listen to the engine to see if he can see what tapping noise is 4.9L is known to be a bad engine and has a myriad of problems. also clean throttle plate on both sides and idle control hole with choke cleaner.
May 19, 2015 at 5:42 AM
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REARDRIVE
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the tapping noise is coming from the idle speed control I can see the gas pedal going up and down what need to be done fix that problem can you tell me how
May 19, 2015 at 6:10 AM
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HMAC300
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did you drive it after replacing it? they have to be driven at 40 mph for at least a mile to set right. it should have been set at a specific distance prior to install as well. was it doing it prior to the new iac solenoid?
May 19, 2015 at 6:31 AM