Hi everyone this is the first time posting.I have a 98 gtx ltd.This thing started last year with a back fire blowing off the water box.Did some snooping and came to the conclusion it was the tirgger coil.Replaced with a new one.Stopped the back fire.Found filters clogged in carbs.Replaced filters and fuel lines.Went to water today boat runs up to about 3500 4000 RPM starts missing bad.If it gets over 4000 runs fine WOT then shuts down it will restart no problem.After a few mins a 10 sec beep but no warning is displayed on gauge.At wits end with this thing.If you have any suggestions im willing to tri it THANKS