bank 1 are the cylinders next to the firewall (#'s 1,3 and 5) i think. Bank 2 are the once on the side of the radiator.
i had a loss of power long ago, turned out there was a small white plastic lock that fell and it was holding something together (don't know what it was though), but you can see it pulling (moving) once the car goes over 4000rpm. it is located on the left (driver side) kinda below the throttle body and behind the water pump belt. Its hard to see, since it really below the intake manifold..
hope that helps.
