Hi, I have had a 2000 Gibson 47 Executive Houseboat with twin fuel injected gas 454 Crusader engines and V-Drives, for about 1 and 1/2 years. The boat has a high RPM issue with 1 engine reaching a maximum of 2700 RPMs and the other a maximum of 3000 RPMs, instead of the expected 4000 to 4200...