I've been having this problem recently. Most of the time when I got out on the big lake. I can get out just fine engine runs great. Coming back after a 4-5 salmon troll at 600-800 rpm. Coming back at 2500-3000 rpm. I will just be able to get it up on plan. Then she sputters and starts to miss and will die if I'm not fast enough to throttle her down. I've put new points, condenser, plugs, plug wires, carb has been rebuilt. I don't know what it could be. Maybe fuel related. Haven't checked. But looking for opinions. Thanks in advance.