Would a very bad throttle body gasket cause a car not to start

What is your question?

I recently replaced a intake manifold on my 92 Chevy Astro, now it will not start all it does is crank over and sometimes back fire. I have a suspicion that it's a throttle body gasket because I reused the old one now it's leaking bad. I just wanted an opinion before I move one.

What makes this problem better or worse?

Does not start

How long has your 1992 Chevrolet Astro had this problem?

2 days