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Not related to my car, but the black 88 that my son purchased from Daves89. He was having random loss of brake boost, first noticed on a recent warm day here. While the brake pump ran, and would come up to pressure, it was slow to do so. The fluid level drop appeared normal for an operational accumulator. The pump even sounded weak or slow. He decided to go to the local junkyard that Dave is very familiar with and I had warned my son that Dave had mentioned it looked like the days were numbered for being able to mine the available donors. In any case, he found two complete boost pumps which he salvaged. We had made plans to test the salvaged parts but before we could get together he installed one of the pumps and it now sounds much healthier and lights now go out much more quickly. We also verified that the later model pump with the steel pressure line can be substituted for the 88 pump that uses the high pressure hose. The thread sizes are different but a simple thread adapter bushing can be installed in the larger opening of the late model pump and the smaller banjo style bolt for the hose threads right in. Pump with steel line is M10 x 1.0, and the early pump with the hose is M8 x 1.0.

Maybe check your gap on the crank sensor a well and if the bolt is tight on the adjustment screw. You might be able to do both without removing the balancer. If the crank sensor moves at all you will have the exact same symptoms. I had the exact same issue, even had 2seater come over and help troubleshoot. After trying everything I crawled under the car and checked my crank sensor. The adjusting screw was loose allowing the sensor to move in and out taking me from a perfect running car to one that would barely start and run.

Try NOT putting the ECM back in place and leave it out on the floor. Maybe for some reason it's overheating.