Re: Severe hesitation in 1987 300E
"The problem started a few weeks after the fuel pumps and fuel filter were replaced."
I always first ask if it's applicable, "what's changed"? You mentioned this started after fuel pumps and filter were changed.
I wouldn't bother with plugs, wires, ign. of any kind. I'd look into any and everything related to the work that apparently brought on this problem.