I have been trying to get my 3500 megacab to run right for a few months now,,first i was getting a code on cyl #1 misfire,,,then slow fan speed,,,then some kind of ECM corrupt code,,went to my local dodge dealer where my cousin works to try and get the latest updates and reflash,,since i bought the truck used 2 years ago,,i wanted to start fresh,,BUT the tech informed me that he couldnt reflash or update because the truck didnt recocgnize the ECM,,,which is original to the truck i beleive,,,does anybody have any idea where to go from here,,,BEFORE i tear into this and install a good old 12 valve engine in there and finally have a good reliable truck..