Good news - And good procedures, too.
I hesitated suggesting simply replacing the MAF without performing diagnosis because the MAF is so expensive. You did your homework and basically eliminated anything else, so replacement was a good call. I know that far too many people have replaced $150 MAF sensors due to a failing connection, and have had to go back later and repair the problem with the $5 connector.
Peeling paint on a Lumina? I'm guessing that it is white, since there were problems getting the white water process paint to stick to the gray primer for several years at GM. The good news is that repainting with real, solvent-based paints (like PPG DBU) will solve the problem so long as all the poorly bonded original paint is scuffed down to primer.