2002 Sea Ray 380 w/8.1 Horizons. W/Gen 2 cool fuel module.
My Port engine won't maintain cruising RPM (3,200-3,400 RPM) after about 2-2.5 hours of cruising. It acts like it wants to stall and sputters and drops to idle speed (900 rpm) but never actually stalls. If I shut engine down for 5-10...