Crusader 8.1 mpi surges at running speed

[Joseph Lacerenza]

I am having a similar issue with fluctuating RPM(s) on one engine (Crusader 8.1MPI - 2006) after running for abt 3 hours at cursing speed, 3200RPM(s). No fluctuation at lower RPM(s). The problem does not repeat after engine runs at lower RPM(s) or is shut down for a period of say one hour or more. Engine temp and oil pressure remain excellent at all times. Fuel for both engines is sourced from one tank. All fuel filters replaced each season (65-75 hrs). My suspicion is that it is electronic rather than fuel related - possibly related to heat in the engine room (?). Did you find a solution to what seems to be a similar problem ? You reply will be much appreciated. Thanks.