My 1991 Honda Civic sometimes won't start. When this happens, the gearshift shift lever won't release and the engine won't fire.

Try pulling the stering weel right sometimes that helps

Perform tests, in Sections A and B, below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563.html

Bad shifting mechanism... wife's did that... jiggle stick, wheel, and beat on stick for a sec.