Hey, I have a 00' 3.8l Manual that has a cut in the exhaust just after the cat on the passenger side. I swapped my engine back in march and it has run great since then, All I had was a code for insufficient EGR Flow. But all of the sudden when I take off it starts going really rough and groggy, then has a burst of speed after it hits around 2500RPM's. It's will run fine in every gear except first and in low rpm's. I had it scanned again and the EGR Code is gone, but now there is a code for bank 1 too lean. I didn't fix my exhaust, So I don't know how this happened. Does anyone know what's wrong and how this happened? I was thinking my clutch, but I just put a stage 2 clutch in and it only has around 10,000 miles on it. Any help will be appreciated. Also my clutch doesn't engage until it is almost fully released, I don't know if this is in every mustang, but mine has done it since I bought in in 07', through an engine swap and a replacment clutch.