My 2wd sapphire cosworth runs fine apart for 1 thing. When I try and drive very slowly like crawling up to a give way etc to let cars pass when I accelerate very slowly and easy the car splutters and I have to press the clutch down and rev it. Sometime it kangaroos slightly if I accelerate slightly faster. But pulling away from stationery is fine just when it's crawling.

 

try disconnecting the idel controle valve when the car is warm

 

try disconecting the idel controle valve when the car warms up