Gava

iTrader: (10)

hey ppl my mate has just bought a cheap k reg import as a weekend toy but It's cutting out in 3/4th at bout 5000rpm to 0 then back up in like a second with a pop from the exhaust some times..any ideas?

its still all in kph and has not been de ristricted

MattyB1983

iTrader: (51)

MAF or most likely coil packs.

madmarx

iTrader: (1)

Maybe boost cut, due to over boosting.

Gava

iTrader: (10)

someone else mentioned over boosting, if there is no lights on the dash would a plug in dyno pick up a fault?

MattyB1983

iTrader: (51)

Does the car have a boost gauge ?
Check all boost pipes for obvious signs of damage.

craigo

iTrader: (1)

Sure if you can find a specialist. you can manually read the light blips of course. Then you can see what problem you might be dealing with

MattyB1983

iTrader: (51)

His CEL light isn't on though.

Clean the MAF.
Check all vac pipes carefully, maybe a pipe has come loose or split etc.
Check coil packs, remove and check thoroughly.

craigo

iTrader: (1)

might a problem be stored but not display. or even more likely light has been disconnected ?

MattyB1983

iTrader: (51)

I'd expect the light to come on though when he is experiencing the fault, if the light has been dissconected then the usual fault reading method would be pointless.
I've had two early cars with failing coil packs and experienced very similar issues as the OP. CEL was never thrown up either.

Id bet my bottom dollar on vac pipe damaged or a dodgey coil pack.

Gava

iTrader: (10)

how much are they likely to be as i got a newage myself i not sure on the classic parts