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Back in the day type 3 from 1970's EFI would start having random firing issues, ditto for toyotas a decade later. The fix was finding all the ground points and cleaning then, then make sure the contacts snugly fitted the connector. Was all low voltage stuff, couple or three volts signal very sensitive to a different sense voltage.
My son's 1990 toyota will fail smog on a dirty engine, passes with a clean one.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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