I was thinking it was a clogged cat after looking through a few threads... but others that come to mind are like boost pills or the TCA. I have checked all the hoses which fixed my problem to a 11-0-0 to a 11-2-5 anyone have any thing else to throw in? Right now I am waiting till I get the cash for a DP, MP, and PFC. Then once I put that stuff one I can narrow out clogged cat.... I figure if it doesn't work then those 3 mods are still important to have.