my clk just developed this fault, revs when starting from cold go from 4000 to nearly 10k up and don, up and down. looked on forums and swiched heater booster off. also plugged into to diagnostic machines from a ex mb employee and comming up with no faults ????? changed the front common rail sensor 165 which made no difference. f filter changed 5000 miles ago. when warm tick over is better but vibrating,.. :( any ideas please.. im not novice when comes to cars as been in motor trade scince 1984, but this is puzzling. thank you petetheskaathotmail.com
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