can u tell me what the problem with my toyota tacoma is?

What is your question?

it has several codes.300,302,303. it ldels rough and lacks power. I have repalced all injectors,all coil packs,all sparkplugs,air filter.its a 2000, 2.4l standard trany.I cleaned the mass air flow senser last night. althow each time i replaced a componit it ran better. it still has the codes pop up after 20 to fifty miles of driving. what do you think?