I swapped a crvtec in my freinds 2000 si and for some reason cylinder 3 is missfireing. we changed the plugs, wires, cap, rotor, and the coil in the dist and Honda put on a new timing belt and they said it was "dropping a cylinder" and they didnt know why. they sugested a valve adjustment or possibly the ecu was having problems running the motor due to low compression. does their sugestions sound resonable? what would cause this?