engine shaking on 2002 Mercedes-Benz S430

i thought the shaking is due to fuel injector needing to be clean what do you think?

Asked by for the 2002 Mercedes-Benz S430
Needs to have full inspection for source of misfire or whatever is causing prob and address as needed. If you start to throw parts or repair attempts at it the price goes up drastically.
1 more answer
It could be multiple problems. Ignition coils most of the times. Eaven a vacum leak could make an engine shake. NO Engine light??