Failing PIP code????

Not always, but you can run the KOEO (Key On Engine Off) and KOER (Key On Engine Running) tests and you should get code 14 (I believe) if the PIP is failing. If you don't know, the KOEO and KOER tests are built-in to the Ford computer; you can get a cheap code reader from most car parts stores that will run these tests for you.
 
when i scanned mine it threw 2 MAF sensor codes but it had really close symptoms to a PIP failure how it would missfire and die and sometimes drive fine my car isnt running due to an engine swap right now but it could be done today i replaced the MAF sensor and if that dont fix the problem then ill replace the PIP i guess.