I have a 1993 300E and took it to the dealership because the engine was stuttering. The service department said it needed new plugs and boots for the coils and quoted a repair cost of over $450 which seemed excessive. I am trying to find a repair diagram to replace the plugs and wires, but cannot locate one. Two questions, 1) does this diagnosis sound accurate, and 2) where might I find a diagram so I can replace these items myself?

Any assistance would be greatly appreciated.

Thank you