Stuttering and high idle - 460 Ford Forum
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post #1 of 5 (permalink) Old 11-15-2016, 04:50 PM Thread Starter
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Stuttering and high idle

I just bought a F250 with the 460. I rebuilt the carb, put in a new distributer, fixed a couple vacuum leaks, new plugs, wires cap/rotor and PCV valve. Now when I just barely hit the gas it sputters and lurches if I give it too much gas. I set the timing to 8 degrees. The idle is around 1800 RPM's and doesn't change with any adjustment to the carburetor screws. I am wondering where to go from here, and don't know what to do next.
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post #2 of 5 (permalink) Old 12-29-2016, 03:00 PM
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Welcome to the site. What year truck? What carb? Could be quite a few reasons for the way it's acting, carb, vacuum leak, mis-matched gaskets and etc. Give us some more info about what you are working on, with so many great folks here, one is bound to have some helpful advice/experience to help bring a resolution to your predicament. Good luck.
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Yeah, it's a hybrid...It burns gas and tires.

No matter how good she looks somebody, somewhere is tired of her sh#t.
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post #3 of 5 (permalink) Old 04-03-2017, 06:21 PM Thread Starter
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High Idle

It's a 1986 F250. I have done a complete tune up, found several vacuum leaks, rebuilt the carb it came with, a 1580 Carter AFB 4 bbl. I've fixed all the stuttering issues, I just have the high idle left. It stays at about 800 -1000 rpm when it's warming up, which makes me think it's maybe not a vacuum leak. The idle goes up to 1300 when it's reached the normal range on the temp gauge.
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post #4 of 5 (permalink) Old 04-11-2017, 03:23 PM
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I would try more timing - like 12 degrees. Auto trans?
Is this mostly stock engine - or do you have a cam, head work, headers, etc., and/or other mods done too?

1982 F-250 XLT 4x4, 5800lbs, C6-BW1345, 466 cid, 9.5:1, TFS290 PowerPort heads, Crane Hyd Roller Cam (278/286 adv., 216/224 @.050), Edelbrock Performer, Hedman headers, QFT HR-780VS, MSD6A and Billet dist., NOS Cheater system, 4.56 gearing, 7" lift, 37" tires.
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post #5 of 5 (permalink) Old 04-12-2017, 06:57 PM
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lrussell is the carb manual or auto choke either way make sure the linkage isn't binding causing it to stay on the fast idle cam of the choke even though the choke butterfly may be opening fully it may not be dropping off the fast idle cam,all the idle adjustment in the world won't change it .Also make sure someone hasn't adjusted the sec.throttle adjustment screw preventing it from closing fully you may have to remove the carb to verify this.If it's not closing fully that may explain your stuttering also, that would require more accelerator pump shot to clear it up.
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