Jerking on high revs, What the hell? Need ur help angels:( Options

[Rav4Race]

Hi broz/sis.

Engine: 3SGTE ST-205

On first gear i can rev fully to 7k with no problem.
On second, i can rev to about 6.6k coz it starts to jerk a bit.
On 3rd gear, the jerks start as from 5.6k:(
4th....5k:(
No need to tell u about 5th gear:(

What can it be? Anyone of u got this kind of problem in the past?
Can it be the spark plugs? i got iridium denso on it (IK20) i ran only like 20,000km with it.
Can it be the spark plug wires? I have the OEM wires which ran only 90,000kms.
Can it be the fuel system? To start with Fuel pump? I have the Walbro 255lph fitted some months ago.
Injectors? Used an injector cleaner recently but nothing has changed (unless i have to change the cleaner itslef:()
BTW CAN SOMEONE TELL ME WHICH % OF FUELING IS OK AT IDLE for injectors? ACTUALLY AM AT ABOUT 90%.

Is it the boost? Am boosting to a max of 1.1 bar (about 17psi) sometimes it hit 1.15bar. I lowered the boost recently but the problem still persist.

Is it evil? Havent met the priest the past 2years:-/ plz help...what can it b? what should i do? I can't race correctly with this bump...

[Batman722]

I think you are hitting boost cut.

[kezza-q]

I think you are hitting boost cut.

I would agree, it has happened to me on track days - black smoke, and jerking due to boost spiking and hitting the cut point. Although it was in every gear for me, so maybe not.