Hello all, new to the thread and could use some advice with an issue on a friend's 1990 Johnson 140hp. My friend states that he was returning from a day of fishing when the engine starting running rough and when he retarded the throttle below 2500rpm the engine ran normally. No alarms noted but every time he advanced the throttle the engine appeared to go into SLOW. He took the engine to a local mechanic and he was not able to determine the cause. This is where I got the boat. The VRO has been bypassed and he premixes gas/oil. I did the basic troubleshooting (compression, checking wiring, fuel system). I put the boat in the water and have determined that it is definitely going into SLOW. I disconnected the temp sensors one at a time and them left them both disconnected. Still went into SLOW. I ensured the VRO plugs were disconnected and stowed. The engine runs great right up to the 2500rpm threshold. Everything is pointing to the power pack. If any of you have other thoughts please feel free to share. Thanks in advance for your help.