Help getting are into my fuel system

Hi all

Here I am again with problems with my freelander,

My freelander is 1999 2.0 di L series engine

I have just replaced the injector seals and leak off pipes, but now when car starts up from cold or if it's been standing for half hour it takes ages to fire up like there is air in the system and a little spluttery for few seconds and smokey and now when driving it's blue/grey smoke when driving but does clear up after a few mins, I've checked all injector pipes and can't see any leaks anywhere, glow plugs working fine as they are new and been checked

If anyone can help or any pointers in right direction I will be truly grateful

Cheers

Just been thinking about it, would the injector leak off pipes affect the starting as there a snug fit but not as tight as old pipes?