Thanks Jimmy. Whats getting me is that this only seems to happen on cold and/or wet mornings ie before 9am - and never happens later in the day,even when the vehicle has been sat on the car park at work for 8 hours or so. Immediately after being fired up in the morning the revs will drop to 3000-400...

Bolton is in England,near Manchester !

Sorry for not mentioning the vehicle is UK Spec.

From reading elsewhere on the forum I think it may be an ETM problem !!??

Some mornings when I start my 1999 S80 it will run rough until I get to about 20mph - The problem seems to vanish once Ive been driving a mile or so. Once the engine is warmed up there are no problems,and drives fine. This doesn`t happen every morning, but when it does the message "Drive Slowly...