hi i need help when i reach 5_6rmp the car loses power but it kickes back in it not a miss it is like the fule is not getting though fast enough. i put 30lts of optimax to a full bottle of octain boost. wat could it b.

 

Sounds like over boost/fuel cut.

 

it is running at 9 boost

 

Im having the same problem but at about 4500rpm, it is probably down to two things,
Spark plugs or coils.
You can also run the diagnostics to see if anything appears there.
Im just about to pick up a set of plugs (cheaper than the coil option) will fit them tomorrow and will report back if problem has gone.

 

ok thankz would be gud as i am off to longleat on sunday

 

new set of plugs sorted my problem out. Car is now running smooth as

 

dont bother using octane booster. the 98 optimax is grand for her

 

..and the tooth fairy really does exist.