98 Honda Civic Stopped in the road with flashing engine light and had to tow it home?

My Civic stopped (169k miles) while driving and now won't start. When checking codes by OBD II scanner, it shows P303, P304, P300 and P1399 which is misfire. Any ideas, how should I go about diagnostics. As car is pretty old, not worth of taking to mechanic

Thanks in advance.

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