Gmc envoy

Check engine light on its reading misfire on cylinder2 i tried everything pretty much,new plugs new coil pack new injectors, dont know wat else it could be please help thx.

if the p0302 is the only code and you have done the plug, coil and injector you should look and compare to a known good cylinder, what the electrical wave forms look like. If the injector looks like another injector and the coil looks like another coil then you may have a mechanical problem with that cylinder. you may want to do a cylinder leakdown test and see if your valves are fully closing.