P0300 Code The Essential Guide to Engine Troubleshooting and Repair

I've read it's pretty common with these trucks. Probably is crappy gas. Try 91 or 93 for a few fill ups and see if it throws a code again. The check engine light came on which turned out to be a P0300 code (Random/Multiple Cylinder Misfire Detected) The car runs fine. no individual cylinders have come up on code..just random misfire code. Also disconnected battery wires as someone suggested to see if pcm would ... I have a 2004 Silverado 1500 5.3l Vortec. I have the dreaded Random misfire code. No other codes. I have replaced all the spark plugs, wires, and coils. How to fix P0300 Code: Random or Multiple Cylinder Misfire Detected A P0300 code is set when one or more cylinders are not firing correctly. Sounds like possible intake belly pan gasket causing internal vacuum leak which will cause random misfires, fuel in oil, hard start, rough idle, low power, etc. A P0300 can be caused by SEVERAL different things, ranging from bad gas, bad plugs, bad coil packs, bad/dirty MAF sensor, bad MAP sensor, lots ... P0300 code ... Received the following - engine was misfiring on initial test drive. Pulled codes and found P0300 random misfire. With scanner, ... It could be multiple things, cap, rotor, plugs, wires, coil, distributor - some new ones are crap, could even be bad connections, or problem with the fuel ... It is coming from the catalytic converter. It's a sound like tin rubbing tin, like a muffler clamp is loose or something of that type.