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 - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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