2004 Mustang GT with weird idling problems. - Ford Mustang Forum
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post #1 of 3 (permalink) Old 02-16-2010 Thread Starter
gtrookie's Avatar
Joined: Jun 2008
Location: Lovington
Posts: 42
2004 Mustang GT with weird idling problems.

Hey guys I recently purchased a 2004 Mustang GT with 82,000 miles. The engine runs great but often when it's stopped completely the idle dips down to between 600 and 900 rpms and sometimes just dies alltogether. But this doesn't happen every time I drive it, sometimes it's fine.

I've cleaned the Mass Air Sensor and the Idle Air Control and checked for vacuum leaks, all to no avail. The weird thing is that when the car is coasting in neutral it doesn't have any problems but when I come to a complete stop it starts dipping and sputtering.

I purchased this car already with a number of modifications on it. Since I haven't pulled the engine apart I only know the obvious mods which are: BBK cold air intake, throttle body and plenum. It also has straightpipes with no catalytic converters. I'm only mentioning this stuff in case any of this would contribute to the problem.

It was suggested to me to get a Diablo or SCT tuner and see if tuning it fixes the problem but that's obviously a big investment. I wanted you guys' thoughts before I made a move.

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post #2 of 3 (permalink) Old 02-16-2010
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racin366's Avatar
Joined: May 2008
Location: Pompano Beach
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Have a look at the air filter and spark plugs.

The artist formerly known as SteedaMatt.
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post #3 of 3 (permalink) Old 03-12-2010
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Joined: Mar 2010
Location: Clinton
Posts: 12
all u did was clean the IAC that isnt to good of a fix. i cleaned mine and it fixes the problem for a short period of time but after a little driving the idle issues come right back. its better just to go ahead and replace ur IAC. Also u your PCV valve could cause that. hit up autozone and replace the PCV, best 3 dollars youll ever spend. Theres one more thing. take ur throttle body off and make shur to clean the back and front of the butterfly plate and walls good with carburator cleaner. this should fix ur problem. good luck
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2004 gt , idle problems , modifications , tuner

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