4kq hard start when cold (vacuum leak?)

[Tom B]

Howdy all,
My '87 4kq has developed an interesting failure mode. When cold starting the
car will start, run fine for 2-4 seconds, than die. Giving the car gas
causes it to die even quicker. After about 15 starts you can get the car to
stay running if you keep the engine revved to about 3k+.  After a minute the
car will run fine, with no problems.

I had the exact same problem on an 82 cgt 10 years ago, and, too make a long
story very short, ended up finding out that the problem was a broken vacuum
line (ask me my opinion about Imported Car Center in Williston Vt :-( ).
When the line was fixed, the car started and ran great. Unfortunately I did
not do the repair myself, so I do not know which line was broken/leaking.

Would anyone happen to know just which line it may be? I am planning on
replacing all of the vacuum lines this weekend, but would like to replace
the one that is causing this immediately.

Thanks in advance,
Tom



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