There's no really effective way to diagnose this symptom using logic. I would start with substitution, because the most likely players in this are inexpensive and almost certain to need replacement or repair at this age anyway:

1) Fuse #6, and to a lesser extent, fuse 4. They are the only ones in the car that can affect your driveability. Of course, the problem is corrosion, not a defective fuse itself. Clean and tighten. Use copper or brass fuses. #6 passes a lot of current.

2) Crank Position Sensor. Look at the cable sheath. Wiggle it while the car is idling.

3) Fuel Injection Relay.
--
Art Benstein near Baltimore

If speed counted, rabbits would rule the world.

in my experience with 240's, hesitation invariably turns out to be at the source and electrical issue even if the symptom is momentary fuel delivery reduction.

i would look at the those components which when falterng can reduce or cutoff even for a second fuel delivery.....fuel pump relay, noise suppression relay

or components which when failing will send no signal or a bad signal to the ecu.....like the amm

Do not take it to a mechanic as they hate intermittent as much as anybody does and beside you pay them to guess. You can do that with us free!

The CPS is hard to detect but if any surface cracks appear in the covering be suspicious and carry a spare. I carry a spare fuel/system relay in the trunk in all my cars.
Like an AMM if you like which Dan said plus his recommendation on the fuse panel needs help every couple of years in wet climate. Water goes there from off your shoes, as the doorjamb stays chilled. It is out of normal airflow unless you use the floor vents a lot. Still moisture moves about.

Remove the air cleaner thermostat if not done already and lock the flap over with a 5/8 inch square block of something. If it is overheated, it will act like that.

Check your vacuum lines especially underneath as the cracks hide on the underside.
Check to see if there are any rubbed in holes or cracks in the accordion hose. I assume you did that when you cleaned it of which you have to be very careful about doing at all. The wire in there cleans itself when you turn the key off but only if the engine has revved over 3000 RPM. It is hard for that not to happen.

A good long look under the hood scares things to do better for me. This is because I have a reputation with them critters in there as I will rip their guts out! :)

Phil

This happened to me and was a failing AMM, I have a spare so it was easy enough to swap in a known good one. It solved the problem.
Clean contacts and replace fuses is a good place to start.
Dan