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My wrench buddy put on some grease, I cant say for sure its that grease but would assume it is.Would the Cat glow red f its bad and would it show the codes that given if it was a cat issue?

It runs smooth at cold start up and after codes have been cleared, then the intermittent starts when it warms up. I'll check the wire to pcm and what s involved to checking the pcm ?

Thanks for the response. Those were the exact plugs we exchanged for the Bosch ones. Same result.

05 Explorer sports trac SOHC flex 4.0 Issue: Parked it one evening and next morning went to start, thought I heard a small clunk or something, not sure now if i even heard anything lol. but engine light came on and truck ran very rough. Didnt drive it. Code says random misfire...