I have a 1991 350SDL, 147K miles, original owner. I have intermittent rough idle and injector knock (really bad until it warms up, sounds like one cylinder to me).

Asked mechanic about repalcing injectors with MB rebuilts, he says can do for $65 each plus labor. With the mileage I have is this a good idea, is the price right? I plan on keeping the car. No signs of a rod problem as others have had.

Thank you.