I recently bought a cris craft 34 ft that was not running, we found that distributor needed to be replaced it was rusted. The motor starts but runs rough and only on four cylinder, when you pull the spark plug boots the spark is hot and snaps, you can hear the injector as well. It seem to run on 2-3-6-7 and seems not to run on 1548. I though that it might be an esa module but know were it is or how to check. The boat is in the water thanks for you help Richard