hello, I have a 2010 silverado with a 5.3 V8 and recently while driving I got a service stabilitrak, service traction control, and a rough idle while also drives with high RPMS. I took the truck home and the code reader read P0304 for cylinder 4 so when I youtubed it the first result was to change the spark plugs. Mine were changed last year so I only changed the spark plug for cylinder 4. That did not work so then I also changed the ignition coil and started it up and nothing changed. I then noticed I smelled fuel so my suspicions went to the fuel injector. I changed 1 fuel injector (the one for cylinder 4). And nothing changed. Frustrated now I don’t know what to do. Any help or advice is appreciated. Also I no longer smell fuel so I think that injector was bad but I’m not sure. Thanks

 

Is it running OK now?

BTW welcome to Chevrolet Forum, but you really need to post this on the sub-forum for later model Chevy pickups, where more techs can can help you out.