1998 c230 plugs/fuel filter
 

getting an intermittent mild cut out/dip in idle when car is still at idle. noticeable, but not major. slight feeling like the car might stall ! car has 76k and mass air sensor was replaced at 50k. thinking about replacing plugs and fuel filter to resolve issue. any tips on the replacement of both ? I believe i have to remove an engine cover to get to the plugs. is the fuel filter by the right rear tire ? Car has had no maintenance except for oil changes/brakes/rotors. All info appreciated !