hi all ive got a problem with fuel starvation my 300 tdi disco strugles to rev or revs intermitantly when started from cold then is ok once warm but does the same thing if accelarated hard to around 3000 rpm theres also a ticking noise thats comming from the injector pump area that gets quicker as i rev the engine. has anyone got any tests i can do to check the injector pump of r narrow the problem down