Have had same/similar issue with mid 90's Civic and early 90's 4Runner, both times it was solenoid/starter.
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This, next time you get the no crank/start problem, tap on the solinoid fairly hard with the handle of a screwdriver.
If it starts up after that, there's your problem.
This, next time you get the no crank/start problem, tap on the solinoid fairly hard with the handle of a screwdriver.
If it starts up after that, there's your problem.
Yep, that was the test in both cases, after I did most all the stuff muddy has done.