Hi sverker! Thanks for checking-in.
It did seem to help some, it still stutters and stumbles, but not as severe. It's maybe 2/3 as bad as it was. Since then, I have dropped a few more cans in, but they did not help any further.
If I knew what components that additive cleaned, perhaps that could help me narrow it down. I would think that additive would NOT have any effect on the MAF sensor.