Thank you Mr. Pepsi. I like pepsi over coke as well. I read your link and he says not to drive!
Gentlemen, I wish you guys lived closer to me.
M in SC, the car is an old hand me down Mercedes inline 6. The obd2 is showing p0304. A misfire in cyl 4. Last time it happened, a long time ago, it was worn plugs. She did fill up at a new station and the rough idle and loss of power began soon afterwards. It may just be a coincidence. The plugs are oem copper and they are due for a change.
For now, assume it is just an old worn spark plug #4, is it going to cause damage driving highway miles for a week? The car idles bad, and has weak takeoff acceleration. But just fine at hwy speeds.