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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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