That looks exactly like the code that came up on mine about a week ago...i'm running the 87 perf too. i returned to stock and then checked for codes again, and none came up...i then reloaded the 87 perf tune and no codes again...still running it with no probs.
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 2008 f150 supercrew, 5.4, 3.73 LSD, tonneau cover, 275-65-18 BFG's. Gryphon programmer. XLT with XTR package. Tinted heads and tails with 8000 HID's. 4300 in the fogs. Gott's Mod. Painted grill.
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