Picked up a clean used 99 ML320, and it has been running smoothly for a month and 3000 miles. Monday AM, after driving in the rain, the engine started sputtering and misfiring at a stop sign, and continued to run very roughly, until I pulled over and turned it off. On the restart, all was fine and the engine runs smoothly, but the check engine light is on.
I'm thinking that water spashed up on a plug wire and caused the misfire. The misfire was picked up by the computer and the gas was shut off to that cylinder. Anyone else had this experience? Car's in the shop now for a check, but my main concern is getting it set up so it doesn't happen again.