Slower is definitely the way to go!!! I would say 1.5-2 nautical miles per hour. Last year my boat was Idling in gear at about 1500rpm. I purchased and installed a new rotor, distributor cap and ignition wires. It ran much better, I was able to turn back the idle screw and now the idle rpm in gear is about 800. That was the difference between catching only a few fish trolling last year to my first keeper this year.
I'm not sure but I also think it is possible to go to slow.
If you can't adjust your idle speed, try like many of the others have suggested....a drifting anchor (about $50 in boat us) or it's cheaper cousin the five gallon bucket!!
Let us know what course of action you take and the results!!
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