Need help code PO355

[Keith.Williams]

 

[RubberCtyRauder]

Possible bad COP #5, switch it with the one next to it and see if code moves to that plug

 

[Keith.Williams]

I swapped it with new ones so I know its not the coil or plug plus replaced the alternator and pcm

 

[Keith.Williams]

And done a compression test

 

[Tnbigbody]

http://easyautodiagnostics.com/ford/4.6L-5.4L/how-to-test-the-cop-coils-1 try these tips out on the coil the hei tester is only $13 at oreillys made by kd tools (I have one)