i had dry wire 6 inches from the plug into the harness, from the maf and ait sensors. i replaced both sensors, code would come back, found the pig tails were dead, changed them and code went away, but my car was running pretty much ok like that. no staling or anything.

if you take the connector off, and bend the wires at the plug to see if they have pulled from the plug, or have cracks and or missing insulation. once air gets to the wires that pig tail is on borrowed time.