XUD Smoke+Shaking it's tits off+hunting revs etc

[Adam.M.Penny]

ive had this problem for the past 3 weeks, ive gone through 3 belts, timed it up a million times because i kept doubting myself, even though the holes lined up each time, a new pump (lucas to bosch) ive had the injectors tested and cleaned, and after all that i never thought to change the filter.... i feel a bit of a T**T if im honest.... im gonna put a new one on tomorro and see what happens... it cant be anything else...