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87 F250 460 Dies when roll off throttle

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Old 06-30-2015, 07:59 PM
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87 F250 460 Dies when roll off throttle
Newly rebuilt 460 4 speed 4BBL, took her out for her maiden voyage and it dies when I let off the gas such as when I come to a stop light.

It idles well and runs well at 3k rpm. What should I check?

Thanks!
 
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Old 07-01-2015, 09:29 AM
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bump bump.
 
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Old 07-01-2015, 03:05 PM
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Idle set right? all vacuum lines hooked up correctly, stock carb or aftermarket???
 
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Old 07-01-2015, 03:41 PM
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I am thinking your IAC valve is inop and somebody has jacked up the base idle screw to compensate. Unplug the IAC while idling and see what happens.
 
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Old 07-01-2015, 03:54 PM
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Originally Posted by jas88
I am thinking your IAC valve is inop and somebody has jacked up the base idle screw to compensate. Unplug the IAC while idling and see what happens.
The OP clearly stated the engine is carb'ed. There is no IAC.
 
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Old 07-01-2015, 08:12 PM
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Originally Posted by daddylee100
Idle set right? all vacuum lines hooked up correctly, stock carb or aftermarket???
Edelbrock 1406

I picked up a vacuum gauge tonight, with my cam the vacuum may be a little low. I will do a detailed tune on the carb tomorrow and report back!

Thanks
 
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Old 07-02-2015, 07:36 AM
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Understood - my bad.
 
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Old 07-02-2015, 08:38 AM
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Originally Posted by cx300
Edelbrock 1406

I picked up a vacuum gauge tonight, with my cam the vacuum may be a little low. I will do a detailed tune on the carb tomorrow and report back!

Thanks
You may need to use different springs inside the carb. When I had an Edelbrock carb on my old 1978 F150 I had the tuning kit to tweak it up. A must have accessory IMHO.
 
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