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

Please Help!!

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Old 03-25-2009, 07:53 AM
  #1  
The Brooklyn Express
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Default Please Help!!

When I start my car it has a slightly rough idle. (it jumps between 500 and 1000 rpm's). At times it also does this while i'm stoped at red light.

1.Can anyone give me some reasons as to why this may be?
2.And how to make it go away?

Thank! you! in! advance!...

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Old 03-25-2009, 08:00 AM
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H0SS302
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almost 95% positive its a vacuum leak. check all the hoses to your intake and make sure they are not cracked, and they are tight.
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Old 03-25-2009, 10:41 AM
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steve0914
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olr check your tps... vacuum leak would jump in the idle real bad...
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Old 03-25-2009, 10:48 AM
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black35th
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Check your Flux Capacitor, blinker fluid, and the search button. This has been brought up at least 75 times this week alone.
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Old 03-25-2009, 10:51 AM
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jvog
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Speakin of blinker fluid, I think mine needs changed. I think ill put the synthetic fluid in this time. The local honda guys say it adds 20 rwhp
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Old 03-25-2009, 11:16 AM
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Sxynerd
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"And How!"
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Old 03-25-2009, 12:08 PM
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99 GT vert
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yo dawg check your IAC i had the same problem and i replaced it and it is fine now
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