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

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Old Sep 15, 2010 | 06:27 PM
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stangant
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Ok so my car is back up and running but i have a problem, the rpm is at about 1200 and will sometimes spike up to 2500-3000. Any thoughts?
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Old Sep 15, 2010 | 06:52 PM
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RyansQuick6
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leak somewhere in the intake system behind the MAF
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Old Sep 15, 2010 | 06:56 PM
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+1 or a bad IAC, but I don't think it'll jump up that high. Has to be a vac leak.
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Old Sep 15, 2010 | 07:34 PM
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stangant
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Well i have a brand new iac on it but it could be bad so ima put an old one on and test it. I have gone threw all the hoses and can't find anything as of yet.
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Old Sep 15, 2010 | 08:38 PM
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Synyster06Gates
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Maybe the gaskets are no good or got a bad seal?
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Old Sep 15, 2010 | 08:43 PM
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yea i'm thinking of taking the manifold back off and redoing the gasket.
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