In the last couple of months, my CL-S has been ideling pretty rough..meaning you can feel the steering shake and it is fairly loud. It even gets worse if the climate control is turned on.

Sometimes I'd be at a stop light, holding the brake pedal down, but not all the way to the down, and the car would kind of idle higher and move forward (until I press the brake all the way down).

I took it in for my dealer's review and they said it was because of Winter Gas and the mix of methanol in it... it is making engines run rough. I have never filled my car up with regular gas, always premium.

Oddly enough, none of the other cars I have driven recently (Accord V6 for example).. are experiencing rough ideling due to Winter Gas...

Any idea what could be causing this?

 

Check and make sure your plugs aren't fouled up. That can easily cause a rough idle as well.

 

ttt
So wayne or jens can see this