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I'd recommend checking continuity from the ECU to the pickup/sensing coils in the distributor.
Not sure exactly what you have, but some of the typical internal ignition coil distributors have a circuit that is labeled G+ and G- and another that is NE+ and NE-.
The large ECU connector pins 17 and 18, G+ and G- about 200 ohms. Possibly red and black wires.
The large ECU connector pins 4 and 5, NE+ and NE- about 500 ohms. Possibly yellow and blue wires.
Also check that there isn't continuity from any of these circuits to ground.
Does it sound normal when cranking? With the cap off of the distributor is the rotor rotating while cranking? Just wondering if the timing belt is intact. If not it will crank very fast and smooth (no compression) and the rotor will remain stationary.
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