2010 Chevrolet Equinox - persistent CEL

2010 Equinox 6 cylinder.
110,000 miles
Last summer changed transmission, spark plugs, O2 sensors, tires, brakes… the works.
Still have engine light on most days… not all???
Will sound like spitting when starting car in morning. Other days it is rough when idling.
Any ideas what I should do next???

What you should have done FIRST is have the codes read.
So have the codes read and post them here, format will be P0123.

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