i have a 07 dodge 3500 cab and chasis 6 sp. i havent hadf it about 3 months all the egr and dpf are gone it run fine but now it started running rough it started throwing codes p0 205 which is no. 5 injector so i took it to shop they said yea thats whats wrong replaced runs no different now there saying ecm is bad 2500 more dollars we will fix it wellany way i went and got the truck does anyone think this could be my problem a new ecm the mileage has just went down a little it seems like it is almost misssing by the waY 205 CODE STILL COMES UP IS THERE ANY WAY FOR SURE I CAN TELL IF IT IS THE ECM. ALSO EVER SINCE THE LIGHTING BOLT light came on it has been running like this