Yes, its'a M111 engine.
I noticed this morning, while driving a piece of bumpy road that suddenly the bad behaviour was gone, very good response to the throttle and accelerating a lot better. It only lasted a few seconds.
So the question is : could it be an electrical connection, loose or dirty cable plug ??
The misbehaviour is gone everytime new plug are installed but what in heavens name makes the plugs only last a couple of days ? The last time I tried F8DC4, gapped at 1 mm. (saw that in a reply to a guy with the same problems on the same engine in a Norwegean SLK 200 with no kompressor).
Again it's getting worse by the day.
Any ideas ????????
Thx,
Nico