Dieseling when I shut off. NOT A DIESEL

[MattHammer]

My truck was running great after the Weber non jet head swap. But that was winter here in az. Low 60s beautiful weather. Now it's low 80s and she doesn't want to die. It's a long sputter like it will turn over a few rough revolutions or even juggle back and forth. Starts great afterwards no hot start issues.

[tortron]

Might want to retard the timing a little. That's often the cause. One time i had a flathead run till the fuel bowl was empty due to carbon hot spots in the head.

[geezer101]

And check your idle speed. If it's idling fast it might be enough to keep pulling fuel. Also make sure your plugs aren't too higher heat range and the air/fuel mixture isn't lean.