Why did you let a shop install them if your a mechanic?
This is the exact reason I don't let anyone work on my truck.
The 3 sets of f1s I had did not have any markings on them.
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RIP DEX
2001 2500 2wd
Diesel pro's cam
Walbro 392
Goff diesel injection
160hp pump
6x.013's by Weston
HTT 62/71/13 over FI 82/92/1.10
Levi's turbo blankets!
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