Like Cody said, only us Motorcraft GP's........they are pricey, but it wont cost nearly as much when a Autolite GP goes out and then breaks off in the head when you try to replace it. IIRC the GP's ffrom Ford are around 10-15 dollars a piece, but will not have to change them again for a long time.
For the IPR, have you scanned for any codes?
Or ever had a CEL?
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