Running badly at low rpm.

[positron]

I know we haven't heard back from OP (blade023), but I experienced something similar yesterday morning on way to work. Massive stuttering up to 3.5-4k and plenty of power after that. This lasted most of my way to work (70 kilometers). It was less obvious on the way back and no sign of any issue this morning. In my case I suspect it's my own doing - the night before, I replaced the coolant and sticking a garden hose down the radiator cap meant water went everywhere. Or perhaps running the engine with tank tilted (so that I can access the radiator cap) might have dislodged some crap from the bottom of the engine into the fuel line. In either case it seems to have sorted itself out this morning.