I have a 97 speedster with twin engines. Driving it the other day no problems except for a little loss of power I've noticed lately. Then after about 30 minutes of pulling a tube, we stopped and the right engine would not start, cranked it as much as i dare. Towed it back changed the plugs, still would not start. Put it up on the lift and the engine started, put it back in the water and it would not start in the water. Any ideas?