Hi there,
There are several possible causes for a cylinder misfire. Here is a list for you.
P0306 GMC - Cylinder 6 Misfire Detected Read more: https://www.autocodes.com/p0306_gmc.html
The code P0521 indicates an issue with the engine oil pressure sensor. Here is a list of possible causes.
P0521 GMC - Engine Oil Pressure Sensor/Switch Circuit Range/Performance Read more: https://www.autocodes.com/p0521_gmc.html
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