Might be a bad ecu. I had one go bad and it kept 1 injector open constantly. It blew a lot of black smoke didn't have much power, and got terrible mpg's.
If you have access to a spare, might be nice to swap one out but kind of expensive to just buy and put on.
By the way, put your cat's back on. You loose major low end torque without them and you will throw a CEL, plus the extra pollution isn't helpful (and I'm not a tree hugger).
Keep us posted.
Everet <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />