Truck has about 100,000 miles engine is a 4.7..Engine light came on,code was #2 cyl. faulty spark plug,coil or fuel injector.Has a rough idle.Changed all three and still the same.Compression test was 120lb.Anyone know what's wrong?Any advice?As always, TIA

Last edited by 5carguy; 07/06/22 04:39 PM.