4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Idle problem

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Old Feb 11, 2005 | 12:43 PM
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Bob99GTConv
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Joined: Sep 2004
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From: Baton Rouge
Default Idle problem

When I turn on the heat or A/C the idle goes up and down from 500 to 1000rpm constantly. I replaced the IAC valve, and I dont have any error codes. Any ideas?
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