I had a 1998 that gave me a P0300. I almost ran out of gas, actually I did but at the pump. When the engine died, before I could shut it off, the CEL came on and only one code.
Obviously, the P0300 is there because of emmissions rules and to try to get you to pull over because of the misfire condition on more than one cylinder. And that is the crux, more than one cylinder.
Should you get P0303 and P0304 and continue to drive, the P0300 takes over and stays there even if cyl 3 & 4 come back to life.
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