Car bogs and runs rough on 2003 Ford Focus SVT

Well, the intake makes a rattleing sound I bought a new one it sounds like a WRX but still has trottle problems. It bogs down and as soon as it hits 3000RPMs it rattles still I need help its giving me a damn headache. and Chiltons manuals all exclude the SVT.

Asked by for the 2003 Ford Focus SVT
1 answer
i have a 2003 ford focus svt and i have the same exact problem...just started doing it one day. still trying to figure out the problem