V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

Car runs rough

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Old Mar 9, 2009 | 03:53 PM
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JOE2391
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Default Car runs rough

OK changed my IAC and my car is still running blew the normal RPM its at like 600 and iits very bouncy.. What else could be wrong all i have done was Exhaust and intake?????????
Old Mar 9, 2009 | 04:19 PM
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im not sure but my alternator broke 3 times and thats what it did about 2 weeks b4 it went each time.. which is probably bc I have a monster audio system.. probably not in your case but just an idea..
Old Mar 9, 2009 | 08:50 PM
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check compression might have a head gaket going out thats how mine acted before she blew
Old Mar 9, 2009 | 09:12 PM
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Originally Posted by JOE2391
OK changed my IAC and my car is still running blew the normal RPM its at like 600 and iits very bouncy.. What else could be wrong all i have done was Exhaust and intake?????????
mines been doing that for years its a vacuum leak that may be your case also
Old Mar 10, 2009 | 03:23 PM
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so how do i kno if i have a vacuum leak
Old Mar 10, 2009 | 05:47 PM
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use a vacuum gauge or if you dont have one a cheap way to tell is to spray brake cleaner around the engine you will notice a change in rpms when you spray near the leak
Old Mar 10, 2009 | 10:22 PM
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were can i get a vacuum gage
Old Mar 11, 2009 | 02:43 AM
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auto parts store
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