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I would:
1. Check your MAF wiring harness to make sure there are no shorts or exposed wires. Focus on where the MAF harness was extended for the VF kit.
2. Try a different MAF sensor. I can send you mine for testing purposes, as I don't plan to drive the car in the next few weeks. As you know, MAF sensors are expensive and vendors won't let you return them if they have been installed.
If it works fine with a different MAF, you know the MAF is bad. At that point I'd look at what caused two sensors to go bad in as many years (probably the harness).
Have you oiled the filter or cleaned the MAF recently?
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