http://www.youtube.com/watch?feature=player_embedded&v=Nypb8_HTenE
weird
My F-100 does that ocassionally. I had a bad ignition switch. When I would hit a bump it would sometimes switch off. When I would put it back to the on position it would backfire and rarely puff a smoke ring.
There's a gif in the gif thread of this. Awesome.
Notice that some of those smoke rings auto-ignite before they break up? \m/ 
\m/
This may actually be the coolest gif evar.
so turbulant unburned fuel.... VERY cool
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