P0300 random misfire, P0506 Idle control lower than expected, 8207,6505,9300 these are GM codes will the use P0300 and P0506. Here is the solution GM canyon and colorado are plaque with camshaft solenoid plugging up,weather you maintance the vehicle like a religion or you dont the camshaft postion solenoid gets plug and causes rough idle every where. Here is your fix there are time I have succesfully cleaned the out with a carburator cleaner or engine cleaner and reenstalled and it worked, there are time I ran I with a engine oil flush and It worked, you gor 2 options take it out and clean it out,and put it back in(clean the oil ports of the solenoid).or run a engine oil flush with a oil change. Now why did this happen and what are the camshaft postion for.It for emmission it took place of the EGR has nothing to do with performance just emmission and headaches
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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