C 270 CDI Idle problem

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142 TPL

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Joined
Aug 30, 2009
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138
I have just started getting an idle problem on the car when hot. The engine RPM will throb up and down slightly. The car runs great and no codes on the star machine. It will do it more if you blip the throttle them let it idle after about 30 seconds it will settle down until you blip it again. Any ideas
I have just been able to recreate the problem buy loading the engine up by turning the steering slightly and holding it***As the engine speed rises up it then drops back. Is there an engine load sensor that tell the revs to rise as things turn on
 

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