1999 f150

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Sep 5, 2005 | 10:30 AM

babyed

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Joined: Sep 2005

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1999 f150

i have a 99' f150 4x4 with a 5.4. my trouble is sometimes if it sets for a couple of days, when you go to start it, it will start up, rev up a little and then die. but if you hold your foot on the gas just a little, put it in gear and take of, it runs perfect. it will not idle, the thing is that it only does it sometimes. my dad has a 99' mustang gt with a 4.6l that does the exact same thing. any ideas?

Sep 5, 2005 | 02:54 PM

LxMan1

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Joined: Dec 2001

Posts: 22,436

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From: Louisville,Ky.

YEP, clean or replace the IAC (idle air control) valve. They tend to stick after awhile. Sometimes cleaning them will cure it for awhile, but if it reoccurs, go ahead and replace it.