I'm working on a rallye for a friend who bought the car which is absolutely mint but runs really badly. Once warm the car will not hold fast idle sat stationary, i.e. throttle at same position holding at 2500rpm for around 5 seconds then just dies off until it's just about to cut out then pick up the revs again. Up the road is pretty similar, dies down and then picks up again. I have set all timing and emmisions up correctly, disconnected lambda probe, chaecked cat for blockages, replaced cooant temp sender and still can't get it to run any better. Compressions are ok and new plugs fitted. With the coolant temp sender disconnected I can hold the revs high without it dying off? Has anyone got any idea's as I'm pretty stumped? Cheers