fuel cut in 4th and 5th gear??
 

I have my 97 mods 2,5inch decat with Supersprint backbox and KN panel filter,other Standard...

When I flor down in 4th it hits fuel cut, when I slovli pushing the pedal No problemo...

same thing in 5th and somethimes in 3rd gear..

How do you know its fuel cut?

If when flooring it (always seems to be in higher gears when it happened to me)
you get a very violent loss of power (feels like you're hittang a wall) it could be that its been overfilled with oil(or just an older car) and you boost sensor is mucked up. This leads it to open the waste gate as it thinks the car is overboosting. Can be cured by cleaning out sensor pipes with brake cleaner or a new boost pack (about £100 i think)

Probably need a slightly bigger restrictor in the Boost Control hose. This may be caused by the decat causing boost spikes.

have you had any water get in ya k and n filter???

this will make it overboost and possibly fry your maf.

It feels like fuel cut, not sure that it is.

Where is boost sensor??

It has 130 000miles on the clock, but thats all freeway, was not abused.....

boost sensor is on the offside turret. It is cylindrical and will have eith 2 hoses or 3 hoses coming off from it. Cant miss it (unless its missing)

Your "fuel cut" does the car just cut out and then continue??? It does sound like fuel cut from when you say you are experiencing it (high gears)

You could get a manual boost controller and actually turn the boost down a bit, also fit a boost gauge so you know whether it is overboosting etc