my car seems to be misfiring alot on low revs but when you push it over the 3k rev its fine

then starts misfiring like mad its like im hitting a fuel cut off which is impossible???????:(

what the hell should i do and who do i take it to
car spec:
my98 uk turbo
blitz cat back
h&s downpipe
blitz induction
blitz bov

any advise please.....shall i just give it in to tsl the closest place ooohhhhh im in leicester??

Sounds like fueling's gone wrong.
I'd wave at the Blitz 'filter' having knackered something.
Can't think of any way of checking anything without some sort of diagnostic kit, myself. Possible unplugging the MAF (as it's easy!) when idling to see if it clears it up at all, but could easily be a plug or something as well.
Have you waggled the various plug connections about a bit? Might just be lose/damp, etc.