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...

[cloqwise]

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...

I've had this problems a few times. First was because i just did an engine change and after about a thousand or so miles tried a fully power blast but would only go to about 120 with some jerking. So shot some injector cleaner thru and it was all good and once the engine broke itself in a bit more. Another reason is the knock sensor breaks so you get the engine light on and limits your ignition timing so you cant go full power, this can give you a few jerks. If its not them then it sounds like it has something to do with the fuel system.