My Honda civic was sitting for three yrs and I started it and it ran fine good . The next day I try to start it and it would not start. . Got gas and good on oil .

. Ensure the timing belt did not take a set and snap. Remove the oil cap, crank the engine, and see if the camshaft rotates.

. Perform the tests below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-2.html#post229012

. Replace the Ignition Control Module and coil, if there's no spark:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-4.html#post265896