New plugs, wires, rotor, cap, ECU ( Wells model F-133 ignition control module) .

Distrib pickup coil sensor test results :
Ohmed out distrib pickup coil to see 400 ohms between orange and purple terminals on the pickup coil side of connector.
Pickup coil black wire showed continuity from connector to ground.

Ignition coil ( still at cool ambient temperature ) test results :
showed continuity between primary ( + / - ) terminals .

Have spent years refurbishing the miles of vacuum hose and emission wires and components .
Desire to keep street legal in Connecticut and have opted at this time not to bypass the MCU .

Replaced MCU approx 5 years ago when the yellow diagnostic box near battery indicated several circuits were not within specs.

Perhaps MCU is bad , wires to /from MCU , ECU ?
This issue persisting intermittently for years .
I feel that this is an issue of intermittent lack of connectivity but can not isolate the trouble spot.

Can MCU be verified w/o accessing it ?
Choices appear to be narrowing cause as : MCU , open or shorted wires between ECU / MCU/ Dist. pickup coil .

Anything overlooked / suggestions ?