What Could Be The Problem?

[Amadeo]

This problem has only arisen recently. When I decide to give it a hit and rip it in 1st gear the car pulls then when it reaches high revs it just cuts off and jerks. All the other gears are fine. I dont think its my boost cut off because even though im still running the stock ECU i have an hks ebc and its set well below 14psi which is the cut off. Can anyone tell me what the problem could be?

Any help will be greatly appreciated.

[gtst1976]

rev limiter mabey. How high is high revs?

[MMM]

coil packs f**ked?