I have a 2001 Merc 225 EFI and while running this weekend when I would reach RPM's of 5000 motor would start missing out. I did not notice this issue when running 4000 RPM's. Now I did juat stop and get gas at themarina but I find it really hard to believe I got bad gas, this is a main marina on Table Rock lake. All othere gauges reading good. Hole shot is strong, Ideas?