JD 2010 dieseling

My 1965 John Deere gas like to diesel when stopping. It has the problem when the engine is warm. Any idea how to stop the problem.

Slow the idle way down, number one cause.

We had a 450 Farmall which did the same thing. The tractor had something like 12K to 13K hours on it, with the last tachometer I saw registering just under 7000 hours. This tachometer was installed when my family purchased it. In that time, there had been nothing done to the engine other than having the valves ground one time. It was typically used as a chore tractor for the year a round, and never truly getting warmed up in the winter time. That tractor was so loaded up with carbon inside the engine. I suspect part of the problem was due to engine oil getting past the rings and valves, as the engine had a lot of hours. I suspect part of it was from not getting warmed up adequately in its daily chore duties, particularly in the winter. I suspect you have carbon build up that is hot enough to ignite the incoming fuel and air mixture, just was we experienced with that old 450 Farmall. Our JD gas tractors were used in various tasks, other than daily chores, where we likely managed to get them up to operating temperatures and run them long enough to keep the carbon build up minimized to prevent that problem. What I will add refers to our 3020. If you have that engine warmed up after running it for a somewhat lengthy period of time and shut it off without letting it idle for a few minutes to cool things down a bit, you will have a loud explosion of the fuel and air mixture in the engine a few seconds after shutdown. The longer the delay from shutdown until explosion, the worse it is. This seems to be attributed to the E10 gasoline. It will not "diesel" though.