Sounds like a bad plug or wire. Otherwise, plug wires are installed in the wrong order.
Inspect those and correct as needed as an initial step.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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