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Most likely, it's unburned fuel. I would begin with a tune-up, and make sure
the timing is kosher and that I've got spark to all 8 cylinders. Then, I'd next
move on to the carb.
If you've got EFI, you might ask the computer what it thinks might be up....
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.