when I start the car its fine but as soon as I start going through the gears the check malfunction light flashes and the car starts to judder then after a while it seems to right itself the light stops flashing until I have to slow down again and start going through the gears I have recently had it serviced and the car has excellent service history and no advisories for the last two MOT's
Running Rough, Starting & Power Loss
Mot's and servicing really have little or no bearing.
your engine has developed a fault,
as the lamp shows.,
get it code read/scanned for the specific fault code and go on from there.