corolla tb swap problems. why?

[Javi]

a year ago i installed a 1.8L throttlebody and a month ago i noticed that when i WOT about 3/4 of the way down the engine starts to bog. but it happens in all gears and all speeds. the wierd thing is that i have an intake on and it still sounds like the tb is wide open. just no power:confused:

i just want to know what causes this and can i fix it? or will i have to put the factory tb back on?

[Astroman]

Did you do the chip swap? What is the part no. on your chip?

[marcus]

a year after??? it could be ur air filter ...might just be too dirty..