P0300 cold start missfire clears up
 

I reset my computer about 4 weeks ago
And when I started it for a few days it would run rough and clear up.

This morning it did the same thing out of nowhere but it misfires really bad

Lasted for maybe 5 mins. And threw p0300

After that it cleared up and ran awesome (cool out)

It rained a lot last night and was very cool this morning

Is it a coil going out. Or something else ?

Most likely coil going bad. When the car misfires check the codes and hopefully next time it throws a code for a specific cylinder. Then just change that coil pack.

Don't rule out your engine harness. From the bend near the passenger strut to each individual coil pack are potentially for wire breakage. Something to check.