John ,I had the same problem. The 'idle control unit' was at fault. and also try the search fecility in this forum, there are a lot of entries on this topic.
ZEE

__________________
1990 220TE
1988 300GD
1989 yamaha V-MAX(sold)
1993 BMW R100R
1956 Willys Jeep(low bonnet)
1982 Honda XL 250
1987 300D
1994 toyota surf (4runner)2.4 TD EFI
1953 Land Rover