I have a 1993 Four Winns 190 Horizon 5.0l EFI that cuts out at high RPM. if I rev it in neutral, it will run fine, no missing, no hessitation all the way to 5000 rpm. Under load, if i ease the throttle up to plane speed, it cuts out very little, if i gun it, it cuts out much more, but slowly accelerates to cruise speed, but cuts out more the closer i get to WOT. IT SEEMS SOMEWHAT Intermitent, and once or twice, I slowly eased up the throttle and it didnt miss at all. It seems to me like bad gas or something starving the motor for fuel. Idles fine. Low speed, does fine. Smooth to about plane speed, then the more throttle i give it, the more itmisses. I need a good place to start, suggestions?