Stroker engine "diesels" after I shut it down

I will try to use the secondaries for idle as I think this started when I opened it up a little on the primaries to get he idle up a tad. Can use the gear/brake method also. The timing seems pretty good but with so much power how can I tell anyways? I just know that the run-on is bad for the engine and it also makes restarting later harder, instead of an instant HIT it needs to crank. Kinda takes some of the "cool" out of the ride".

Again, thanks FABO!