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BND

Was wondering or if anyone can help me on this ecm? Anyways its a M11 celect plus and was randomly shutting down. I looked but couldnt come up with anything though I thought could be fuel shut off solenoid or the Engine position sensor if memory serves me right. Ive been busy and a local guy I know looked at it and started it and started idling rough smoking black and never seen that happen he came back and after turning key on was making noise like a chatter or clicking so he tapped the ecm and it stopped. I have not been able to look yet but if it is the ecm how do I go about that? Buy the right ecm according to part number from online somewhere and then is it possible to download the program off my original as a backup and create ecm image? Is it possible to then program to an ecm im able to find as long as the part numbers match up? Thanks for any replys.