These are really common. It is usually the PCV hose elbows that are cracked and sucking air, especially the one that connects to the rear of the intake manifold. The other common cause is a dirty MAF sensor.
One of the elbows had a little hole in it. Its looks like over time the rubber just got soft and cracked, causing the hole. I found a piece of hard rubber hose in my garage that is the same size and at least for now thats the fix I went with.
The truck seems to idle a lot smoother, so hopefully thats all it was.
'99 Ford F-150 regular cab longbed 4x4 Off-Road with 5.4L V8
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I just went through exactly the same thing, only I replaced the MAF sensor...for nothing. The part you're looking for can be found at a dealer for about $30. The repair took about two minutes....not even time enough to finish my beer.
I when to NAPA and advanced and no one knew or could find what I was looking for. Anyone got the part number so I can take it with me? Its starting to p*ss me off starting the truck at every stop light.
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