2004 Sierra 4.8 P0300 Random Mutliple Misfire

[tombstone]

Hello all.

 

This day has left me quite frustrated. I was sitting in traffic and my truck started running like crap and it threw the CEL. I went immediately to Advance Auto and they pulled a P0300 Ramdon/Multiple Cylinder Misfire Detected. I have NO idea what could be wrong with this thing.

 

I put on 300 miles since I filled up yesterday and was running around earlier today with absolutely no problem.

 

Can anybody point me in some sort of direction? I do have the GMPP extended warranty and have less than 30K on the truck.

 

Thanks in advance.

 

Jeff

[tombstone]

One of the spark plug wires was completely off the plug and another was loose. Reset them, cleared codes and I'm good.