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Replaced plugs wires and engine runs worse. Could the coil pack be going out?

(1999 Ford F-150)
in Arlington, TN on August 16, 2015
4.2 lte Ford F-150 1999 with 121,000 miles
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Popular Answer
on August 16, 2015
That's certainly possible!... However I think you should re-check the plug wire firing order to be sure there're not crossed... Also easy to break//crack the 'white porcelain' spark plug insulator when tightening... OEM coil is numbered for cylinder id.. Passenger side cylinders are 1--2--3.... Drivers side cylinders are 4--5--6.... Front to back... See below:
. 1--2--3 > passenger side
|| < < front of engine
. 4--5--6 > drivers side
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