The last few weeeks, I have noticed my car is experiencing a rough idle, and my gas mileage has dropped to 15 mpg. I have been so busy, I have not looked under the hood for the most obvious answer, a loose spark plug wire. Assuming it is not that, what else might it be? I will take it in to the shop as soon as I have minute, probably next week.

Tom
92 500E 110,000 miles