Just purchased a GW 30' with twin s250TXRU Yamahas, boat last used in 2008, new fuel,new filters, engines ran like crap, flushed carb bowls and seafoamed carbs. Port engine runs super at all rpms, stbd engine ran up to 4800 rpms and started surging, replaced plugs, filters and low pressure pumps still surges, can get to 5200 rpm for a second then loses rpms, engine will run consistently at 38-4000 rpm with surging, starts fine, no excessive smoke, sometimes idles fine sometimes sputters, any help would be appreciated
