My 1996 Explorer just rolled over 200.000 miles, replaced plugs, wires and coil pack with DENSO parts. Before the new parts there was no check engine light, truck ran OK, quick start, not a lot of power, now it is showing Codes PO 351 and PO 353. Bought Motorcraft wires, coil and plugs and replaced the Denso I had installed. Still shows same codes.. Swapped PCM, same codes. Kicked bumper, same codes. Checked wiring sequence to coil left-123, right 465.
Any clues to what may be wrong. I like my Explorer, should I take it to a dealer for a $1.000,00 checkup?

 

Check the primary and secondary coil wiring and connectors for cylinders 1&3 for shorts or opens. The coil pack wiring, each cylinder should have 12v and the other wire should be pulsed to ground by the computer to fire the cyinder.You could have had damaged wiring and it displayed it ugly face when you disturbed it during the tune up.