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Please Help-urgent Problem-truck Dies

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84gmcjimmy

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I went to get insurance on the Jimmy today and it ran perfectly before I left. When I came back with the stickers and went to drive it, it stalls unless I leave my foot on the gas.
I try to drive it, and as soon as my foot leaves the pedal to brake or put the clutch in, it dies. It's not driver error as it has never done this before.

WHY IS IT ALL OF A SUDDEN NOT RUNNING?

I played with the idle speed and it doesn't seem to change it at all. It has a good 1/8 of a tank of gas (more than it did before I had it running smoothly) so it cannot be gas. It stays running as long as I give it gas. As soon as I let off the needle falls on the tach and its no longer running.

So, does anyone know why it would die like this for an unknown reason? It doesn't idle at all.

Please help, I am seriously about to lit this on fire and be done with my troubles forever.

Thanks in advance.

S.
 
Has it been sitting for a while? If so you probably have a float stuck or a bunch of jelly in the carb. Please give more detail about the last time it ran well.
 
Can o' carb cleaner and some gas-anti-freeze-dry-out stuff ... spray carb cleaner in the carb (duh), and pour the anti-freeze stuff in the tank.

If the gas has been sitting a while, it gunks up -- this is why the others have said what they said (which is all true! :) )

Also check the fuel filter in the carb, and then throw it away and go with a (metal!) external inline filter.

-- A
 
Were you messing with anything under the hood? Any inspection under the hood? Wondering if you had a vacume line knocked loose.
 
had the same issue.turned out to be a vacum leak. used wd-40 to find it. turned out the gasket under the carb had gone bad.
 
Using WD-40 to find the vacuum leak, while it is running? Does it make bubbles or what does a vacuum leak look like?

Thanks
 
ive had a carb gasket do the same thing,


well since it has spark that leaves you with a fuel or air issue


now which one is it is the problem:D

any whistle like sounds?
 
1979jimmy350 said:
use carb and choke cleaner spray around the carb if the engine speed changes thats where the leak is
Click to expand...

I can't really do that because without me on the gas, the truck won't stay running. Unless I get someone to stay inside the truck with there foot on the gas...
I will see what I can do.
 
use a stick, or lean a brick on the gas pedal, with another brick behind it, and just adjust the "idle" you want, and start working on the truck.

It worked for me when I had to run the old fuel through my truck. (and yes I realize there is probably a better way to get crap fuel out of a tank).
 
I'm not a carb guy, but i would also check the fuel filter.
 
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