Duel mass clutch

[Rbw]

Hi all, I’ve recently got my deceased brothers car a insignia cdti eco flex nav, the car is on a 59 plate with 138000 miles on the clock, 

I’m here to ask for your help

1st I’ve had 2 glow plugs replaced ( the expensive ones) 

oil & filter changed 

air and cabin filter changed 

the problem is…..

when it’s cold ( first start-up ) it runs really ruff don’t know if it’s the EGR  that needs cleaning??

im just hopping it’s not the clutch/ duel mass flywheel that needs changing 

once the car has run for about 30 mins it seems ok

plenty of power once warm 

Any help please 

Roy