Engine misfire? Code 0300

Hey

I just bought my camaro a few days ago, and the SES light has been on. Today I went to autozone to pull the codes expecting an o2 sensor problem (because when I bought the car, there was a new o2 sensor in the trunk) but they told me it had a "random engine misfire" problem.
I bought 3 new ignition coils and replaced them all, the previous owner said he just changed the spark plugs and wires. I pulled one of the spark plugs and verified that it looked new.
I got the guy at Autozone to reset the codes, so I went home and changed the coils and drove it around without the light coming back on.
Later tonight I was driving again and the light came back on.

A common answer I found when searching, was that the cat could be the problem, but I have no rotten egg smell, and
I think its important to mention it does not feel like the car is "constipated" or bogging, to me it feels and drives exactly like it should. Also, I never hear or feel any of the engine misfires.

Also, I am new to driving a standard but now I've pretty much got the hang of it, but I dont know if mess ups could cause the readings.

If you have any other ideas I'd appreciate it, and would driving my car like this risk any damage?

Thanks a lot

Oh and there are 91k miles on the car

Hello and welcome!!

Your random misfire problem could have been solved by your new coils or o2 sensors install. Take your car back to Autozone and have them re-run the codes. It could be anything from a malfunctioning EGR valve (especially if you are new to manual tranny's) to a busted vaccuum hose. Your best bet is to re-run those codes, and start from scratch, that way you are not barking up the wrong VERY complicated tree.

Good luck!

I put in the coils two nights ago, then today I put in new plugs and wires and the problem is still there.

An o2 sensor would make sense since there was a new one in the trunk when I bought my car, but do they commonly cause misfires?

Ill bring it back to autozone to see if its still throwing out the same code.

Thanks

I've bought the cheap brand coils and had a few of them bad, but that doesn't sound like your problem. I'm thinking EGR, maybe.. Does it idle rough?