I drove about 15 minutes, went to a store, came out 15 minutes later, drove down the road a few minutes got on it a tiny bit and then noticed 'service engine soon'. I took it to auto zone and it said "PO300" - the PCM has determined that multiple random misfires have occurred. Troublecode OBDII (Alpha) P Code. Is this something to be concerned about? What should I do?

 

P0300 can be hard to diagnose - I've thrown it a couple times over the years and just cleared it without any problems. You can look up the diagnostics for your year at gearchatter.com

 

should i stay away from driving it?

 

Did they clear the code for you and it came back on immediately the next ignition cycle? Fine to drive as long as it's not "flashing" on and off. If it was a fluke (plug just misfired or something) the SES for P0300 should turn itself off after 3 cycles without seeing a failure.

 

no they didn't clear it for me at all ... should they have?

 

Don't know what their policy is - maybe they just read them only, never got a code read at AutoZone? If it doesn't go off after 3 or 4 ignition cycles I'd do a manual PCM reset and see what happens.

 

how do you do a manual pcm reset and what will that do?

 

go figure - it just turned off by itself today! I hope this is a good thing

 

check your spark plugs check connections... as that is very easy to do and could be a problem. I have had a wire just not snap on all the way to where i had misfires (but i was logging w/efilive and i was like wtf)... so i checked all wires and booya