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Maybe check to make sure the AIR stuff is not leaking and letting air in to throw off the A/F ratio. I have the Diablosport Predator which can monitor the O2 readings to see if they show a strange ratio. I've seen the rough idle on a car with a cracked PCV hose letting air in and throwing off the A/F so check all the hoses and AIR block off plates/gaskets. P0300 is the multiple misfire I think so that could be coils on one whole side or vacuum leak across all cylinders. A scanner might pinpoint 1 or 2 cylinders prior to the P0300.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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