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Reply To: Chevy vortec 5.3 Check engine light: rough idle and misfires

September 18, 2023 at 8:06 am #779880
GM Fan
Participant

I would retorque bank 2 side of intake, if its still doing it then you can do a smoke test. If you are certain there are zero vacuum leaks then id replace the MAF (sometimes cleaning it doesnt always fix it). If it still doing it after the MAF, then get a stethoscope or a long screw driver/piece of metal and hold it on each injector while its running and listen to each one for a consistent “click” sound. If they all sound ok then it could be a fuel pump/regulator issue, but i doubt thats the problem. My money is on either a bad MAF or intake gaskets not seating properly

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