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94 3.8 high idle

Old 01-10-2019, 10:22 AM
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BN7877
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Default 94 3.8 high idle

So I just got my hands on a beat up 94 V6 Mustang. I replaced quite a few parts but the car has a high idle and at the even slightest touch of the gas pedal it sends the RPM to about 1500/2000...and it stays there. When I put it in gear, it drops to about 600 and the car can drive normal. I have cleaned out the mass air sensor and replaced the IAC from AutoZone. Is there something I am missing?
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Old 01-10-2019, 11:21 AM
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Urambo Tauro
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Vacuum leak?
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Old 01-10-2019, 11:26 AM
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BN7877
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I hear a hissing but it sounds when it's in the high RPM
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