I have a Mercedes E200 1998 that sometimes while moving the RPM will drop and not respond if I press on the accelerator. It happens once in a while and as such difficult to diagnose. Plugs and air filters have been replaced.
Get your OBD codes scanned at any parts house and that will eliminate much guesswork, Bring them back here and one of us will be happy to help you with advice on what to do.
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