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Q:

starts fine has no power on 1999 Ford F-250 Super Duty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
changed fuel filter and spark plugs new gas and added gas treatment
(2) Answers
are there any trouble codes? is it misfiring on accell? if so coils are most likely the cause. also check the mass air flow sensor for contamination and make sure the intake hose clamps are secure.you may need to go to a ford dealer to pinpoint which coil is bad if it is an ignition miss because of their capability to do a power balance test.