1999 Mercury Cougar with 2.5l v-6 and manual trans, approx 125,000 miles. I have a problem with the engine increasing RPM when I disengage the clutch. As I accelerate from a stop and shift gears, each time I throw out the clutch the engine RPM climbs... starting from where it is when the clutch is thrown and usually to a high as 3800. I can sit there and watch the tach climb! The RPMs will hold there until I shift and re-engage the cutch, loading the engine. This problem also sometimes happens when I come to a stop and disengage the clutch, although if I keep the car in gear until almost stopped it will not occur (engine load seems to drag the RPMs down). There are no engine codes being logged. I checked the throttle cable and there is no hang-up (anyway, the RPM is climbing... not just holding). There is no problem at idle... car starts and idles fine at specified RPM. Any help is greatly appreciated.... I think the car is haunted. Thanks!

I know there was a recall for the accelerator cable..inner core wire of cable frays and breaks over time causing the vehicle to go into a high idle...
Just a thought..

like mentioned by JIM look at your accel cable and your "TPS" sensor on the throttle body
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3 Explorers and 1 Ranger
2002 Nissan Sentra SE-R Spec v
1970 Ford Mustang Mach 1
1969 Ford Mustang Mach 1
1968 Ford Mustang 302 Coupe

have same problem only when ambient temp is warm just wandering if you found anthing out

I've seen idle speed motors stick but not out of control high as first mentioned!

T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/