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.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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