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Old 12-24-2011, 05:51 PM   #1
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Low idle

Recently had the cracked intake manifold and two fried coils replaced, but my RPM's whether in park or in gear fluctuate from 1,000 to 500 cold start and at operating temperatures. And sometimes the RPM's will drop to 400 going into gear.Two different shops aren't showing any error codes in the computer in my 2001 GT 4.6L automatic mustang. Any suggestions?
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Old 12-24-2011, 05:57 PM   #2
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Re: Low idle

Between 500-1000 is normal
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Old 12-24-2011, 08:49 PM   #3
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For it to flux up and down all the time though, it didn't do that before.
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Old 12-24-2011, 11:58 PM   #4
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If u recently replaced ur intake I would look for a vacuum leak.
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Old 12-25-2011, 08:26 AM   #5
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Clean or replace the IAC
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