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Changed out sparkplugs,wires,coil pack and code PO303 came up again.Car hesitate on 1998 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Hesitate will accelerating and check engine light comes on and go off.what could be the problem.
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Have it diagnosed by a reputable repair shop. Misfires can get costly with guessing game. Possible ignition problem, Scoping it should further shed some light on ignition faults. Check fuel system also, a failed injector cyl. 3 can be the cause. Or it can be mechanical, cylinder compression test and leakage test can be performed to check mechanical integrity.
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