Now I have a real dilemma. My B4C was coding out a cylinder 7 misfire and running kind of rough. So I decided to make some upgrades and see if it would fix the problem. I did a whole top end rebuild with new heads, head gaskets, injectors, got rid of the exhaust manifols and installed headers, new plugs and wires and a new coil on cylinder seven. After all that, it is still running a little rough and coding the same code. Has anyone heard of the wiring harness to the injectors malfunctioning or maybe the computer malfunctioning and causing this code?