The DME or ECU is your car,s electronic brain and the EGS is the gearboxes brain, they basically learn your driving style, I rest mine after the wife has been driving, you can guess why, but you do need diagnostics for this as I don't know if the battery reset works?.
The MAF is an Air flow Meter situated between your air box and throttle body, with an electric connector from it, this some times gets dirty and needs a clean, goolge search should help you on that, rather than me write a whole page on it!! also you may want to give the throttle body a clean whilst your at it, Brake cleaner is the preferred method.
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I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!