2000 Pontiac Grand Am misfiring cylinders 2 and 3

on two cylinder misfires and they changed catalytic converter in first place..firsable stop going that shop...
okey basically you need air-fuel and spark to get fire in engine..and when is misfires it should missing one of them..i saw they replaced only ignition side of the misfire and you still have a misfire..this mean you may have a bad mass air flow sensor it is sending wrong info the control module so it doesnt send enough fuel to get fire or something wrong in fuel system( fuel pump-pressure regulator-(fuel injectors are most posible) )

try replacing ur sparkplugs and wires.one single bad wire can cause a car to misfire,try testin the wires, to make sure u get a good spark