HI Russel.
Unplug the MAF sensor to see if there is any change in the below 1800rpm, you say you cleaned the MAF sensor sorry to say that is not a good move, you have most likely damaged the MAF.
The MAF as be cleaned by some members but it does not really work to be honest once a MAF is out of spec replacement is the only cure, always use a genuine Bosch MAF after market ones will fail quickly.
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