I would go back and double check that vac reading, normally it should be about 20 on a good engine, that year i would expect closer to 18, but do a snap throttle test, it should drop to nearly zero then increase to about 25-26 then drop back to 20. if you have 25 at idle then you need to see 25 ish peak, but 25 at idle is too high anyway.

Double check fuel pressure too, this should be fuel return system and regulated at 2.5b, 5 bar is way too high.

Also what is lambda sensor voltage while it is flat?

Also to test the ignition, just set the voltage scale on your scope to low volts about 500mv and just touch the probe on top or side of coil, you will pick up the pattern this way, and then adjust scope and trigger.