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Idle drops when put in neutral

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Old Oct 26, 2005 | 05:22 AM
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Idle drops when put in neutral

hey all, when i start my truck for the first time of the day, and turn the headlights and heater or AC on it does fine. but when i get driving down the road and go to push in the clutch, the idle goes down to about 400, back to 1000, back to 400 until i give it gas. it started doing this when i hooked up my stereo system with only a 300 watt amp. i had the battery and alt. both tested as good. what do you all think? thanks
 
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Old Oct 26, 2005 | 06:44 PM
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What year truck? What engine? Is it fuel injected?
 
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Old Oct 29, 2005 | 09:34 PM
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it is a 1999 f-150 4.2l v6 4x4 flareside, fuel injected. thanks again
 
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Old Oct 29, 2005 | 09:44 PM
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My first thought would be to take the throttle body and IAC valve apart and clean them up.

But the stereo thing is a little bit weird, and needs to be eliminated as a possiblity. What did this installation involve? Messing with the original radio wiring under the dash, and hooking a wire possibly to the battery +?
 
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