Aum 03'

[Line_sy]

Hi wondering if anyone had any ideas

Car seems to lack power, done a full service with all correct plugs, oil etc and regular to and check MAF thats fine ! All standard parts apart from forge diverter valve.

Problem is that fuel pressure just dies at 4,000 revs though not bringing up any fault codes, so Im driving give accelrator hard and it just gets to 4,000 and dies on me, if I lightly accelerate it doesn't die till about 5,000 but still dies off, very odd and just lacks that acceleration, that bite on ur foot it once had and the spring back on the peddle if you back peddled by mistake doesn't happen anymore.

Just can't work it out any ideas appreciated

Thanks in advance