Originally Posted by
In-Tech
I am assuming you have a 5 wire Delphi MAF? Please tell me it is NOT mounted directly to the throttle body? If the ducting and pcv system is hooked up correctly, a stock 5.3L engine will move about 225 grams per sec through the MAF at ~5000 WOT. If it is substantially lower than this, the MAF is bad, quite common. The gm/sec at warm idle neutral/park with a stock 5.3L should be ~6 and at 2500rpm in neutral/park it should be ~23-25.
If you need one, do NOT buy a rebuilt/reman MAF, they can be worse right out of the box, even AcDelco reman.
DELPHI AF10043 is usually reasonable priced.