Rapala Glass Shad

I am a current owner of a older 2001 Nitro 750DC 90 HP Mercury 2 stroke. Boat runs perfect, no issues, but Trolling it won't do it. Smokes, Coughs, stutters, 2 strokes are not made for this. I am getting where I love to Troll crankbaits at times. I am forced to use the electric motor to troll plugs on my Nitro. Thinking of selling and Investing in one boat with a newer 4 stroke engine but I hope i could make it one purpose, be able to troll plugs for hours, run place to place etc. How well do the 60-115 HP engines run at idle speed? Could you run them all day at Idle speed and the engine will take it without issue? I know how quiet 4 stroke engines are, I am definitely wanting one. However, maybe they won't do what I hope, to have one boat to do everything I want. Looking at Crestliner Ranger, Tracker series with 60 -115 HP 4 strokes now. My other idea is Buy a Supreme or Shawnee boat with a 20 - 25 HP Yamaha (which I KNOW will troll all day), But Rough weather you won't go fishing, your staying home