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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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