Why is my 5.3 L missing and rough idle intermittently?
Why is my 5.3 L missing and rough idle intermittently? 5.3 L Missing and Rough Idle Intermittently I have changed Spark Plugs,Wires ,Coil Packs, and removed Fuel Injectors and soaked overnight. Engine code is a P0304. Misfire Cylinder #4. Most of the time around town is alright. When i put it on highway, it will surge like its cutting off and then pick right back up and be fine. Fuel Presure is 55 psi. What causes a truck engine to miss at idle? I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly...