This article is about v8 SHO Taurus but it shows well , that things and codes are not always what they appear..It is my experience this is the norm type of event , not the odd..If you live anywhere near this shop in Wi.he has a superior understanding of fuel injection and diagnostics. It is a great place to get buggy fuel injection problems fixed and these type places are hard to find..
http://www.babcox.com/editorial/us/us120232.htm
http://www.babcox.com/editorial/us/us120232.htm