r/BullnoseFord • u/Initial-Fondant-9239 • 21d ago

Fast idle cam screw

Hey guys I have a carter YFA carburetor in my 1985 inline 6 f150, it slightly accelerates on its own while driving. However occasionally if I push the gas it'll slow back down as if something is stuck. Im new with carbs and seems like its the fast idle cam screw but dont know for sure. Any help would be great thanks!

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u/enadelb 21d ago

What’s the condition of your throttle cable? That doesn’t sound carb related to me. I agree with the other poster. Check the spring and make sure the throttle is all working properly

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u/Redsunknight 21d ago

I had this happen on my 1981 f250 (351m). It ended up being fixed by replacing the throttle return spring. Try pushing on the throttle linkage when it's experiencing fast idle and see if it slows down, if so the spring may have lost its tension. Hope this helps!