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It's a 2010 Ford Fusion Sport with a 3.5L engine. I have never experienced any misfiring except that it may have been happening on Sunday when the engine was slow to turn over and running rough. I turned it off immediately when I heard all the racket. Tried it again a little later and it sounded horrible the same way.
It's at the dealer who wants over $3,000 to tear it down and try to identify the problem. They then said if I need an engine it is $5,200 and $2,300 for labor.
Tough question. My first thought is it was knocking. My friend says it was clacking and grinding. Could not tell where it was coming from and I definitely did not want to leave it running while leaning all over to identify the location.
What a nightmare !!