Rough Idle at Start up
 

Our 1992 300E had suffered from a rough idle that will almost cause the car to stall until the car had benn drive a couple of miles. Then out of the blue the problem just disappeared.

Well now it's back. The interesting thing is that the idle improved when the temps here in Atlanta dived into the 30's and 20's. Now the temps have begun to moderate the rough idle on start up has come back.

Could these two things be related? I suspect it's the temp sensor.

Anybody BTDT?