Mitisubshi Montero sport

1999 montero sport 3.0 v-6. 126,000 miles. The montero has no power. Origionally it died and my niece had it towed to a shop and they put on a fuel pump and filter. Then it had no power. So they put on a timing belt and tuned it up with new plugs and a crank censor. Still no power. She took it to another shop and they put on another timing belt and then it wouldnt run at all. So to help her out I looked at it. It was out of gas so we put gas in it and it leaked fuel from the injector fuel rales. We replaced one injector that I thought wes bent and put on new o rings. This stopped the fuel leaks. But still no power. I removed the catalytic converter this was no help either. By no power I mean it starts not well, verry hard to start when it is hot, runs about 25 - 30 miles per hour and wont go any faster. I think it is not running on right bank cyl. 2-4-6 the intake ports are clean on these and carboned on cyl 1-3-5. Electronics checked by dealer and another shop show to be ok compression is 175-185