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Code poo21


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I own a 2016 Nissan Frontier automatic. It has a OBDll code P0021. Has rought idIe and hard time to start. If you let it sit for awhile it will start. But once you shut down then restart it wont fire up. The starter  turn it over yet it wont fire up just turns. So I  changed both camshaft position sensor and crank sensor. Both valve timing control solenoid. Chang oil and filter. But still having problems to fire up. Any suggestions  what might be the cause  would be helpful 


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Thank mountainmanjoe