Hello, I have a 70hp Suzuki four stroke. The boat got stuck under a dock and was partially submerged when the engine was tilted up. Only the front/bottom of the engine got wet. I immediately rinsed it in fresh water and have started to try and get it running. It starts after a few tries if I give it throttle and will run on 3 cylinders only. The bottom 4th cylinder is not working. Where do I start? I'm guessing clean or replace spark plug and maybe spray WD40 inside? Could this be an electrical issue? Thanks for any advice you may have.