Hi i'm getting blue smoke from a cold startup, but clears after 10 seconds, also It can take a while to start when it's cold outside. ie +4deg. When it does start it is very lumpy for a few seconds, like running on 4 cylinders but only for a few seconds? Also getting a top end rattle which dissapears when engine has run for a while, although this seems to be getting better. Starts fine when the engine is warm! no smoke no rattle fires up on first urn of the starter! Any ideas? Engine is a 2.5 tdi AKE with 190,000 miles Cheers.