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Ok, my 2002 F150 4.6 threw these two codes late last week. Took it to Autozone where they read the codes. First, i cleaned the MAF, reset the light. It came back on. Next, replaced the MAF, reset the light, came back on. Now, it idles rough after it's warmed up and shut off a few times at traffic lights. I am thinking it's a vacuum leak. Anyone here have any experiance with this?
check your intake plenum for a leak. it may be hard to find but if you use a can of carb cleaner and spary it down it will idle up if there is a leak. sometimes you need to use a scan tool with an o2 sensor graph to find it. but the plenum tends to be a common place for leaks.