Thanks for the feedback.
Update: only partial tests completed due to lack of time/daylight.

Car is my sons at college so I don't have full access so testing is whenever I can.

The symptom has now changed to being slow to crank (like a battery that doesn't have juice but just makes it over, like it cranks over a few times before it starts) but then starts fine and runs fine, doesn't require gas or stumble now on warm start. maybe this is a clue to what may be failing/about to fail?

Its nice to have another 240 with same parts to troubleshoot and prevent throwing parts at it.

Checked all plugs and they look good, all normal coloration.
Verified all plug and coil wires are seated.
Verified cap and rotor are free from corrosion.
Swapped coil from my other car.
battery cables look good and grounds look good.
FPR was dry and no signs of fuel in vac line.
Car has 14.2 charge when running, so I assume the ALT is good.
Verified CPS cables are not frayed or smashed or melted, did not remove it though.

Will try the following on sunday when car returns:
swap battery from other 240
swap ICM from other 240 that has bosch, the current one looks aftermarket.
maybe swap all plug wires and dist/rotor just to be sure?
don't really want to swap CPS but may.
I guess I will focus on electrical/ignition items until I exhaust them before looking to fuel delivery. Any other ideas or tips are welcome..