2001 Infiniti Q45 Questions

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The knock sensors and the Solenoid vale was replace along with the gas line. But my check engine light is still on , and I can not pass the emission test. EDV was fine, so now the guy at Auto Zone stated it my be my Map sensor keeping the light on
sometimes the lights will go off then it runs good till they come back on. Have read wheel sensor,ABS,Coils.Where do I start?
After long periods of driving I notice the smell of oil being burned and also smoke from underneath my car and sometimes through the vents.
some miss at idle at first then a full missfire for a day then cleared up and by disconnecting battery for a hour the check engine light went off and car is running fine now ..need to know if the obd2 will id which cylinder
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