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Does your car have an engine shock ?
How old are your engine mounts ?
Sometimes these are things which were being damped when those items were in good condition...then can be felt later when they need replacing... but appear to be engine running symptoms as compared to shocking symptoms...
Does your car injector have a rack damper ? MB put them there to allow future adjustments to keep the engine ' smooth'...
Does your car have a knob on the dash for the adjustment of the idle ?
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