I have a dodge ram 2500 with a 5.7 hemi. I used my scan tool and the codes P0203 and P0203 came up. (Cylinder 3 & 4 control curcuit) So i went and checked the ingnitipn coil and spark plug wires. I replaced. The ingition coil and checked for spark both perfect clean spark. So i started checking injectors the injectors didn't tick in three and four so i thought i had bad injectors. I replaced injectors 3 & 4 and it didn't help at all. What is wrong with this thing?