My FI Frustrations Continue, Still have engine cutting out Options

[dralf]

I keep purchasing components for my 1975 D Jet system but to no avail in solving the mystery of why it will sometimes cut out when the reves are about 2500 and the engine is under load. For those who have read my earlier posts, I now have new wiring harness, coil, points, condenser, cleaned the dizzy, new Auxiliary Air Valve, and cleaned all wire connections. Also replaced the fuel filter. My recent purchase was a new MPS for mine had a diaphragm leak. I drove around the block and was happy for the first lap since my adjusting the valves and timing seemed to improve acceleration. Unfortunately by my second lap the engine started to randomly cut out as it have before. My path forward is to replace the vacuum advance diaphragm on the dizzy which I found a leak. also to check the cylinder head temperature sensor, and the throttle position sensor. I there anything else I should be checking or replacing ? I am thinking about setting up my timing light inside the cabin so I can verify that during those times where the engine cuts out the spark plugs are still getting power. I hate to think my ECU is bad. Also where or who can check that out if it comes to that ?

[GregAmy]

Related to Post #5 above...more than once I've seen posts related to relay plate and harness connector problems. I experienced that myself, had the car simply shutting off at random times (fuel pump cutting off).

Remove the wiring harness connectors and carefully use a razor blade to slightly bend open the male quarter-sliced electrical pins. Clean them all off and lube with dielectric grease.

Same goes with the quarter-sliced male pins on the relays themselves.

Reinstall, fingers crossed.