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I had a similar issue when I KILLED my MAF (without realizing it). Major up/down surge on the idle.....went to Toyota dealer to compare Ohm resistance on a new & my old MAF. I must have burned a wire somewhere.
Cleaning with CRC MAF cleaner will do the trick, if you do it right away when you suspect your MAF got dirty.
You *can* use an aftermarket suction pipe that holds the OEM MAF in place, now do realize that they are eBay quality sometimes....
Running with no air filter will change the A/F Ratio as well, in short if you run an aftermarket filter you will have differences in A/F Ratios, tuning & FPR would be a great idea.
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