I had surging problems but not as bad as you are mentioning and no cel. I did the following that sorted out the problem.
-cleaned my air filter
-cleaned my intake and throttle body
-cleaned my maf
-reset my e-gas pedal
Not sure which step or, if it was a combo of one or two that sorted out the problem. They are all easy to do and any would recommend doing it to know that you can get to the bottom of your problem by a process of elimination. I know you have mentioned that you have cleaned your maf already.
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