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the motor is missing and will not idle. its like the plugs are not firing. on 1999 Ford F-350 Super Duty

It is 1999 gas v10 ford 6.8 liter, 24,000 miles.

Asked by for the 1999 Ford F-350 Super Duty
Have this checked out before parts replacement. Mechanic with a good scanner can save you some money! There are a few possibilities for rough idle. Only 24,000 miles,, most likely a vacuum leak. Obviously sets around a lot, check for any signs of mice under hood, they love to hide out in engine compartment and chew on vacuum hoses etc...
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Ignition coils are the most common issue, all the time.