OK guys need some help. I have a 2004 Mazda 6 3.0. It will start but idles a little rough. And when the gas is applied it won't go more than 2 miles an hour. No CEL. I've done a exhaust back pressure test which it's clear. I inspected the pre cats. Look fine. I did a smoke test and found a vacuum leak at the egr valve. So far I've replaced all 6 plugs and coils, plenum gasket, egr valve, fuel pump, all vacuum lines, cleaned throttle body and cleaned mass air. When I hook it up to my computer my STFT is perfect on bank 2 and 99 percent lean on bank 1. I replaced the o2 sensor on bank one but still only get .015 on upstream o2 and .000 on the down stream. Any ideas