"My Jag (with Ford engine) has a frustrating and dangerous problem.
The idle speed increases when the car is in motion, getting up to 1500 rpm - which when in 5th means acceleration with no input from me!
With the cluth depressed it drops to about 1000, and when the car actually is stopped returns to the correct 800 (with occassional surging"
Sounds to me like a faulty throttle position sensor and/or a carbonned up throttle /air inatke.
Neither would register any ECU faults. Dismantling job .. and a proper electrical test on the throttle position sensor - checking voltages etc with an oscilloscope...
EDIT: your local garage are incompetent.
Edited by madf on 22/02/2013 at 13:45
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