I have a 2005 Volvo Penta 5.0 GL-E. Carbureted, bone stock. Powers a 19 ft Larson Senza.
I'm having an issue at high RPM. Basically, above about 3500 RPM, there is a noticeable intermittent stumble. I don't usually cruise around at those high RPM's, but I'll occasionally pour on the coals...