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Old 01-03-2009, 01:36 PM
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Cutting out

hey, thatnks for reading this. i hav a 76 chevy truck it has a small block 400. it ran good until yesterday, every time that i try to take off it cuts out but it doesnt die. it kind of sputters. does anyone know what might be wrong. thanks

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Old 01-03-2009, 01:38 PM
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re

By the way, when i put it in park and rev it up it sounds fine but when i put it in gear it it does that sputtering thing,lol sorry i dont know what it is.
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Old 01-03-2009, 01:44 PM
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plug wires
vacuum leak
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Old 01-03-2009, 01:47 PM
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carb or distributer.
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Old 01-03-2009, 01:48 PM
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i checked all the wires and they are tight. but where or are the most common vacuum leaks at
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Old 01-03-2009, 01:54 PM
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spay some starting fluid around the base of the carb or anywhere else you might think its leaking vac and it should rev up
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Old 01-03-2009, 02:24 PM
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ok and if it revs up how do i fix the leak
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Old 01-03-2009, 02:34 PM
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depends on where the leak is at where is the leak.
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Old 01-03-2009, 02:49 PM
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wherever its leaking you will have to change the gasket on what is leaking is it vacum line or what it is . just trying to help.
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Old 01-03-2009, 02:54 PM
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Sounds like a muffler bearing problem from here...

Ok, Ok ... check your fuel delivery. An engine under load requires more fuel. It might act that way if, say, the fuel filter was almost plugged off ... ???
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Old 01-03-2009, 03:03 PM
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yea it could be the fuel filter stopping up/or you got some bad gas. makes good sense 66gmc
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Old 01-03-2009, 03:10 PM
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Sounds like a classic accelerator pump issue if it is a carb. More info on the engine is needed. Is it carbed, what kind of distributor etc.
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Old 01-03-2009, 03:46 PM
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wow thanks guys. ya its carb its a quaderpuke(lol ). it has the points, just the stockdist. i rebuilt the motor and the carb.
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Old 01-03-2009, 03:50 PM
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im savin up to get a better carb but i need this one to get me by, so i rebuilt it and i havnt had a problem with it until yesterday.
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Old 01-03-2009, 06:00 PM
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If you look down the carb while pushing the throttle with the engine off you should see a good shot of fuel. If not you probably have a bad accelerator pump. It is fairly easy to replace. You will probably need to buy a whole rebuild kit to get one.
The other thing I would check it point gap. Should be about .017 - .019 with the point rubbing block on one of the dist cam hight points. If you have or can borrow a dwell meter set it to 28-32 degrees.

The accelerator pump is a common issue with that style carburetor.
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