Suzuki HELP!!!

[bgizzle]

I have a 2003 Suzuki 225 with an electronics problem. Before it used to just throw the warning buzzer and go into limp mode, I could turn off clear code and go on like nothing happened. Then one day I left the launch went to get on step and nothing, only 3cyl out of 6firing one whole side doesn't fire and yesterday I was talking it they with boat mech while runnin 3/4 throttle at a whopping 1600rpms and bam she kicked on all 6 and got up I backed off throttle and when I got back on it 3cyl there on. Now to the trickier part. Sometimes ill be idling and it shut down no warning and when I turn the key on before turning it over when it beeps and cycles fuel pump etc. it won't beep nor start but I keep the key on and sit there it will all of a sudden beep and then I can start it and then it does the same thing sometimes runs longer than others. I think electrical and shortage of voltage somewhere being a computer operation not letting but 3cyl fire and doing the wierd shut off no beep then beep then start/ then shut down and repeat. I'm stumped now. Pls suggest something besides getting a new motor I can't do that at this time!