I wish I could give you some more advice but I have nothing. I only initially responded because of my experience with the P0507 error. Maybe unplug your MAF and clear the codes to see if the CEL comes back on. The car will run in some type of special mode. If the CEL doesn't return, maybe your MAF is bad. Again, thats the only thing I can think of but the MAF could be completely unrelated to the misfirings.
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