Please Help! TD4 Fault

Hi,

just wondering if any one could help me diagnose what is wrong with my TD4 (2002)
I have had no problems with it until the weekend.
as I was driving once it got to 30mph there seemed to be no pull and like the power wasn't there. it did gain speed but very slowly.
as I was taking it to the garage on Monday it cut out and the engine management light came on, I had it towed but once it got there it started first time and there was no engine management light... I am a bit useless when it comes to knowing about anything like this (I have to admit I rely on my dad and if he's not about what the garage tells me it is )
But now every one is a little bit stummed as the engine management light is now off so its not coming up with any fault.

any ideas on what it could be would be greatly appreciated

Thanks

get the low pressure fuel system .. pump / filter .. looked at
( and remember to drain the sedimenter device )

I notice all your posts are asking about this problem, yet you still haven't introduced yourself in the relevant section, try doing that and you may find you'll get more answers

lp fuel pump in drivers rear wheel arch