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Spark plug wire fell off

2686 Views 8 Replies 4 Participants Last post by  RayVoy
My 99 5.7 K1500 started running like crap, 2 days ago. On the way home from work my CEL came on so I scanned it when I got home, misfire in cylinder 7. Went under the hood and the spark plug wire had come off the spark plug. The wires were new 16 months ago so not sure why all of a sudden I’m came off. It snapped on nice and tight and wasn’t lose.....BUT the truck is still running like crap. Nothing is showing up when I scan it. Should I assume that spark plug is crapped up now? Or could the wire be bad if it arched while it was popped off, it was only driven about 6 miles in this configuration mostly at 30mph.

Also I am getting backfires on deceleration.
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I literally just checked them all everything is right and I still have no CEL/DTC or freeze frame data on my scanner showing any issues
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