F22a6 wont go past 3000k

[KB7]

I heard of that situation too, but if im not mistaking you can by jumping the ECU connector and if it stays solid orange that would mean the ECu is bad.

sometimes, well more often than not, an ecu, does not know that it, (the ecu), is bad. the ecu many times suddenly fails to "see" or "control" a component of the car, and will "point fingers", saying "this other thing is bad, not me".

i am not saying your ecu is indeed bad, only by swapping out the indicated part, or the ecu will you truly find out, just sharing that ecu's, (and tcu's on automatics), tend to not know when they are bad. a tcu usually goes nuts pointing many fingers, ussually at the solenoids. i know u do not have an auto, i read the whole thread to this point, just adding info.

[KpoweredCB7]

Could it possibly be a throttle position sensor? That may (if faulty) not allow the engine to rev up past a certain R.