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I have a 2010 sierr...
 
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I have a 2010 sierra multiple misfire code

  

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I recently put new head gasket on my 2010 sierra bcuz I had white smoke from the exhaust and a fuel smell 

I also changed my intake manifold gaskets, knocker sensors and wiring harness, plug wires and spark plugs all new while I had everything tore apart

As soon as I tried to test drive my entire truck was shaking so I put the code reader on and 0P300 I think was a multiple misfire 


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Pray the job was done correctly. That way you won't be looking at engine failure. Have you done a leak-down test yet? Since all the parts are new, I would first make sure everything is good and tight, and then do a leak-down test, after do a smoke test.


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