Engine -1998 johnson 130 hp v4 90 deg. looper
History - Rebuilt powerhead had a bad piston, 3 hours on engine at 1500 -2000 RPM with 32:1 oil mix, disconnected the VRO. Idles great at 1500 - 2000 rpm
Problem - Above 3000 rpm engine will surge and rpm's will surge, At WOT rpm's surge from 4500...