Did you try the throttle relearn?
My shield was about 12" long and deep enough that I could wrap it about half way the back of the lower filter. I screwed it to the metal bumper after hand bending it into shape. What you described sounded just like how my car acted but I don't recall if it gave me a code or not.
Swapping the MAF wires should make it change sides if that is the problem but if it's a bad MAF wire it would also change sides. I would say it's worth trying.
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