2006 Ford Five-Hundred. ODBII: P0171, P0174, P061B, P2106
I suggest check the easy things first. Vacuum lines, could cause a lean condition, fuel filter restricting the fuel flow lean condition. Carefully clean throttle body with proper cleaner. I'm a shade tree mechanic but these simple things work sometimes. You didn't mention if you have the cvt trans. If you do and you are going 75 80 on the highway coming to a hill will cause it to race that high. Then when the hill is crested it will slow down, I don't like it either but it is the nature of the beast. I often cancel the cruise on big hills on the highway so it doesn't do that.
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