fast idle and I think I know why
I have intermittent fast idle, only when i let off on the gas slowly. I have tracked it down to my throttle body valve not closing all the way when I let off on the gas. If i punch the gas pedal it returns to normal. If I push the throttle shut by the return spring on the throttle body it idles fine. So, do I need to clean the throttle body while off the jeep, I tried to clean it by hand but it didn't help, or would a stronger return spring do the trick, do these springs wear out?
Look at that grub screw underneath the throttle cable, I read an article in JP magazine that was exactly the same as what you wrote. There are bearings inside the TB that could go bad if not greased but it would be unlikely. Check where the able comes through to make sure it's not catching the sleeve.
Make sure your throttle body is clean as well. Mine got a little build up in it and would not close all the way. I took 5 mins to clean it and no problems since.
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