CEL, terrible idle, sluggish and heavy feeling. Car was "running to rich at idle

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Cleaned MAF and it made things 10x better, but for a fleeting moment. Symptoms returned and so did CEL. Replaced MAF and everything smoothed out, acceleration/vibration/idle- all good, for a half hour. CEL light is back on with p0100 code. Acceleration hasn't changed, still doesn't feel heavy or sluggish anymore. Rough idle and vibration sporadicly making appearances.