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It is P0202 and P0302 P0202 - Fuel Injector Circuit Malfunction Cylinder 2 Most likely cause a failed fuel injector or shorted wiring harness. P0302 is a misfire in cyinder #2 from the injector problem.
check fuel filter and check fuel for water or contaminents
then check fuel pressure with gauge also while driving
may have pin hole in leads - spray water with salt solution over HT leads while engine running and then rev to see or here spark jump(missfire)
recheck spark plugs - did you crack any on installation/removal/installation?
what are the codes and description if stored?
what is engine live data parameters like do they look normal (right specs for range/operation)?
this happened to me, only she was misfiring as opposed to not firing at all, i got the plugs and leads replaced (one needed a helicoil as the threads were worn) but chevrolet themselves did the job on it and told me the the camshaft was blocked with old oil, they flushed that and reflashed the ecu, and she was right as rain again
however it could be a timing problem? not too sure of timing procedures!