Originally Posted by
BaronVonAutomatc
Man, it's been a while since I fooled with a YF, but fast idle is usually controlled by a second idle screw that engages the throttle only when the choke is closed. Eighteen hundred rpm is too high, but not ridiculous - 1,200 - 1,500 is probably stock (check the emissions sticker under the hood.
Here's a link to a vacuum diagnosis chart:
Reading your vacuum gauge
I'd start by checking all the plugs, plug/coil wires, distributor cap and rotor. A lot of "carburetor" problems stem from the ignition system.
Yes it is controlled by a second screw. It's adjusted as far down on the fast idle cam as it will go. That's what the shop told me anyway, I will double check that.
You're right about the stock fast idle range. I would prefer it be around 1200 though. I had no problem with this before they rebuilt the carb, so it's either something to do with the carb or a new problem.
Thanks for the link. I'll check everything you mentioned. How could I go about testing the coil? Could I test it with a multimeter?
Thanks for the help!