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#1
03-15-2005, 05:35 PM
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99 Mustang rough idle
Mustang V-6 idles smooth as silk with the A/C on but as soon as it is off the engine runs rough and misses. Any Ideas???? I have tried plugs, reset computer, wires, etc.
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#3
03-18-2005, 11:40 AM
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Re: 99 Mustang rough idle
The Mustang idles at 750 RPMS with the AC off and continually misses. As soon as the AC is turned on it continues to run at 750 RPMS but the motor runs as smooth as new.
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#4
03-21-2005, 08:48 AM
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It still could be the IAC. With the A/C on the valve is in a different position (more open) to maintain the 750 RPM. Yours may be partly clogged causing the engine to starve for air without the A/C on. Otherwise I am stumped.
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