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CPI unit
If you have the Vortec "W" motor than this is probably your problem.
It sounds like one or two of the components of your CPI unit are leaking gas. This is a very common problem with the vortec "W" motors. Additionally, I had to replace these parts on my '92. The components that go bad are the fuel line (nut kit) that go to the injector and the fuel pressure regulator. They leak gas which gets into your intake and causes the problems.
Its not a very hard problem to fix, or expensive. I got the lines at a local GM dealer for $50 and i ordered the regulator off of 1aauto.com for $60. All of this is located under the plenum which is underneath the orange Vortec cover.
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