ok i just got a skunk2 pro series intake mani with a 68mm throttle body for me b16. i put them on and off the back i was throwing two code. 7 and 14, so then i went back and put on the stock throttle body and the code 7 was gone. after i did that i also tryed to fixed the code 14 which is the iacv.( its brand new)

but today when i was drive my car it was breaking so beween 500 rpm to like 3,000 rpm and i still have the code 7 and 14.. and my gas milage went down hill.. what cant it be? i will give reps for helping