I have recently had my faulty Multitronic ECU repaired which I hoped would also cure the rough lumpy idle my car has, but unfortunately it hasn't.

Basically when the car is still the engine stutters and the rev needle bounces from 600rpm to 1000rpm, however if I put the Multitronic box into Neutral 'N' the problem isn't quite as bad.

When the engine finally reaches normal operating temperature the problem isn't too obvious but there is still a faint stutter that can be felt in the car when stationary.

I've been told it could be a timing issue as a result of a recent timing belt replacement, I've also been told it could be related to a faulty EGR or faulty injectors.

Incidentally the car does have the worn DMF which results in a rough noisy start of the engine when hot, it's been suggested this may also be causing the rough lumpy idle.

Any ideas where I should look first?