hi all i have a 2006 vrs blt engine.and it started to judder on ile when cold when it does it it makes a noise hard to explain noise not banging or rattling.if i rev it slightly to 9500 rpm then stops completley and when warm it never does it .i have thought dmf but thought it would do it when warm as well only ever does it when cold?any ideas would be great  

Egr on the BLT does that right? No personal experience but have read that