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I'm not really sure the MAF cleaning will help a whole lot but doing it won't hurt.
You should check all of your grounds as well, high RPM stumbling could be because a ground shakes loose at that frequency.
If this was an SR I'd say check your coil packs and coil pack harness. Since it isn't and your main ignition crap has been recently replaced you might want to go over everything you changed - like if you happened to of changed your fuel pump go and make sure all of the connections are good.
That being said it wouldn't hurt to go through all of your sensors and give them a good "shake test" (when the motors running shake the connectors w/ your hand and see if it effects the idling or if they feel loose, etc).
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