If your using good known maf's and they are going out you should probably check your wiring first. Something it causing them to short out OR you just have a bad string of maf's. I had the same problem a little while ago. I am on my 2nd SOHC KA maf and I keep my stock SR one for backup. If you plan to run a Z32 maf, you need at least a SAFC if not another method of tuning.