Thanks for that, I'll test it when I get a chance.
I think the issue is somewhere in fuel injection... Maybe blockages or leaks that evaporate to quickly to spot!
Also, there is a box attached to the injection unit "potentiometer"? or something like that?? Mine was falsely adjusted by a not so specialist mercedes mech. - perhaps this affects it also....
Thanks for the link, I was looking for that page a while ago
Cheers.