My dad's expedition did this occasionally. It was a combination of things shorting out the coil packs on several cylinders over time.
It had suffered coolant and oil leakage that would seep into the coil pack "Wells" and eventually short them out one or 2 at a time.
This is a 97 expedition with approx 365,000 miles on the original drive train. Ultimately replaced the intake and valve cover gaskets and 4 or 5 of the coils to solve it completely. This was last year, still running strong.
My advice would be check the codes and spark plug wells out.
The smell could very well be the guts of one or both catalytic converters burning out. If that is the case you may have a semi-permanent check engine light afterwards.
I use this scanner with an app called "torque" on my phone (and tablet) I wish I knew how to make that a live link with a realistic title but I do not.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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