This is just my own experience. Had the same hunting idle problem. Even after the complete 90K service at the independent, it still did it. Two years later the MAF kept giving me CEL's, so I replaced it. Now, no more hunting idle.
The easiest way to tell what MAF you have is to pull the old one and read the part # off of it like WhipE350 says.
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2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap
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