Becuase the MAF elements get dirty and the engine doesn't get a real read on the air it's taking in so it doesn't deliver the correct amount of fuel. The MAF may or may not play a direct role in idle speed but the information the computer takes from it at other times does.
Pacific Green '96 Contour LX V6, loaded '98 Grand Prix GTP 14.88/91 bone stock, awaiting new times from 3.4 pulley, CAI, U-bend removal but it's creeping up on the... Calypso Green '92 Mustang LX coupe, 13.56/101
3-time local class champion autocrosser
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