Frustrated and Need Help. Carb? Vacuum? Help?

[bots21]

Ok, so I've been lurking around the sight for a while and have learned a ton from other posts. Now I'm lost and need some help. Here's what I've got. 79 sii 304/727. Re-gasketed last year, rebuilt carb, eleminated egr, running a pertronix unit in a prestolite dist hooked to a summit street and strip with a summit coil. Originally had smog equip but was half removed by the po and finished by me. Gas tank removed and cleaned, gas lines replaced. 99% vacuum lines relaced. Power tuned carb for timing, replaced vacuum advance in dist.
So here's the problem. Starts and runs good, no problems. Maybe a slightly high idle but not bad, which made me think there was vacuum leak somewhere, which is why all the vacuum lines where replaced, but can't find it. Tried the spraying starter fluid around and nothing. Once its running, I put it in gear and it immediately dies. Starts right back up, but then dies again when it goes in gear. I figured it was the vac advance, but just replaced that and same thing. Brake booster is essentially new, so I can't imagine its that. My last thought is that there is a crack in the carb base or body, which is causing a vac leak, thus making it die. Or maybe there is something with the trans kick down that is making it choke out when it goes in gear? Long shot and unlikely but who knows, obviously I don't.
Any ideas or help would be appreciated?
Thanks in advance,
chris

 

[int77345]

Do you know the rpm of the "slightly high idle" and is it smooth?

 

[ronmc1954]

Welcome bots21, I was wondering have you pulled the vac hose off the brake booster? Pull the hose and plug it, then try to motor and see if things change. There seems to be a rash of bad boosters causing problems on the "net" recently.
Good luck
ron

 

[Michael Mayben]

I need pictures of the top of the engine setup so I can see vacuum routing, po-virus shit, and detailed shots of the entire installation. I need that first so that we don't just start throwing out scenarios that are meaningless.

We don't do "git 'er dun" tek on this forum, we fix stuff correctly and then move on to the next item(s) on the punch list! There is a method to diagnosing issues that doesn't involve the shotgun approach.

 

[bots21]

Ok, so I figured it out, and it was nothing like I thought. I thought the acc pump was working correctly, but it turns out it was only using about half the stroke, meaning I had the linkage on the wrong slot. I feel kind of silly, but good at the same time because it was something simple. In any case, I took it out for a nice spin and it worked great. Thanks for all the help and advice. I hope I can count on you nice folk again when I have my next problem.
Chris