2003 2.5 v6 tdi missfire help????????

[mouse]

well this is my first post lol and not a good one.......

iv got a 2003 passat estate 2.5 tdi 145k on the clock and she seems to have developed a miss fire but only a slight one.

when on tick over she has it and you can just feel it through the car and there is a little miss fire when you give it some but without loosing any power. its only just started doing it and it was intermittent at first but seems to be doing it all the time now.

iv popped engine cleaner in and loads of fuel cleaner in as well. the turbo is ok and was only replaced 10k ago and i know its not the clutch as its fine, like i said no power loss but can feel it and hear it when giving it some stick does sometimes smoke on start up but only for 20 seconds and not all the time.

any help would be fantastic!

thanks mouse.