I tracked down a vacuum leak on my diesel-gas conversion today - bad intake
manifold gasket. I put a new one in, torqued the bolts to spec., and went
for a drive. About half way around the block, another leak started up again.
I haven't pulled the manifold to check if its blown again, but I suspect it
has.

I'm thinking it could be a couple of things; 1) I didn't retorque the
manifold bolts after warming up the vehicle, 2) I damaged the gasket during
installation, 3) the manifold itself is slightly warped, or 4) aliens.

If it is warped, any suggestions? Do people use RTV or some such with a
gasket? If anyone has a procedure for doing intake manifold gaskets on an
I4, I'd be happy to hear it. As you can tell, I'm making this stuff up as I
go...

Matt