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There have been quite a few guys post that they were having issues with the new Ford gray replacement CPS.......specifically, their trucks were failing the cylinder contribution test for #3 and #8. They put in the black CPS, and all was fine. I would assume that there would be a significant drop in power if #3 and #8 were failing. In mine, power seems the same......just runs smoother and quieter with the black CPS. But for an extra 2-2.5mpg, I'll go with the gray CPS, and just hope that #3 and #8 run fine.
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2001 F-350 Crew Cab XLT PSD 4x4, Long Bed, 6-speed, 3.73, Manual Transfer, Power TTT Mirrors, 122k miles.
1989 Toyota 4x4 xtracab SR5 V6, Beat to heck with 200k+ miles and still running strong.
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