2003 Pontiac Grand Am 2.2L P0300 Random Misfire - Solutions After Replacing Plugs, Boots, Injectors and Ignition Module
I've tried nearly every common fix for the OBD2 code P0300 on my 2003 Pontiac Grand Am with a 2.2L engine, including replacing spark plugs, plug boots, fuel injectors, and the ignition module. Despite these changes, the random misfire indicated by P0300 continues to appear. I'm at a loss as to why this issue persists. Any insights or additional troubleshooting steps would be greatly appreciated.
I recommend replacing the coil pack—this is the long black rectangular component that connects to the spark plug boots. A faulty coil pack is a common cause of random misfires in vehicles like the 2003 Pontiac Grand Am, and it's likely what you're experiencing. This fix has proven effective for many users with similar symptoms.