Killing my 304

[Sharps Shooter]

Hey FSJeepers.
Been a long time since I was active here. Life got in the way. Been back to working on my J10. Got it running, but it's dying at random. Usually when I begin to decelerate. Once this begins, it's a 6,000 lb thorn in my side to get it going again. It restarts quick, but I'm killing it every time I engage the transmission. Any suggestions on what I'm missin?

Thank Y'all


Update.... Think I found the problem. If not,... It's still a potential problem to be addressed. A possible crack in my intake manifold, behind the carburetor.

[J20 project]

First thought, big ass vacuum leak.


J20

[joe]

That'd be my first guess. Huge vacuum leak causing a severe lean condition.

[Sharps Shooter]

Thanks guys. I thought I got all the hoses replaced a couple years ago, but that makes sense. Might have had something come loose in that time.

[rang-a-stang]

Make sure your Brake Booster holds vacuum. sometimes they fail internally and cause a ginormous vacuum leak.

[Sharps Shooter]

That was the last thing on my list. I'm gonna be checking it when the weather clears. Hoping I can get it done soon.
Thank you.