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I think it's time to replace the MAF. Aside from the Hot Film type Mass Air Flow Sensor, this part has the Intake Air Temperature sensor integrated into it.
You cannot fix this Intake Air Temperature sensor by cleaning the MAF. If it is wrong, all you can do is replace it.
You can test the Intake Air Temp sensor, which is really just a 'thermister' - it changes it's resistance to a constant electrical current based on temperature.
Remove the MAF and connect an Ohmmeter to pins 1 & 3. You should be seeing 2.3-2.7 kΩ @ 20°C (68°F). Any other value and the MAF must be replaced.
BTW, a high Intake Air Temp would cause the DME to lean out the fuel supply, not enrich it because Hot air is less dense than cool air. Seeing less air mass, the DME would reduce (not increase) the amount of fuel supplied.
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