I keep getting error code P0304 which says its cylinder 4 misfire the engine starts shaking a bit and most of the warning lights in my dashboard turn on and it disables the parking brake , I took it to a shop and they took out the fuel injectors to visualy inspect them and moved injector 4 to a different cylinder but the same error keeps coming back cylinder 4 misfire , I keep having to spend money and still have the same issue. It only does it on a cold start .