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

Hesitate will accelerating and check engine light comes on and go off.what could be the problem.

Asked by for the 1998 Ford Expedition
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.
Thanks for the feedback,will look in to it.
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