Bosch pump problem???

[Blaze tub tom]

Guys my dtub is taking ages to start but the glow plugs are new once the engine does start it runs awful and it sounds like a misfire this is right up the revs u can't drive it steady as the engine is allways lumpy.. Checked my injectors and they're ok checked fuel going to the injectors and found no.1 not giving as much fuel as 2,3 n 4. So is it a pump problem or...??