I am not familiar with your car, but on the intake manifold, there should be multiple places where vaccum lines are attached, just remove one and attach the pressure gauge. BUT this you can only do after the car starts, the 16-22 inch Hg is what you should get on idle, and the vaccum test can reveal exhaust problems will not solve your startup problem. Did you actually check if your cold start valve is functioning ? Look at my reply to Jorge. You can actually test it, this is the most important component for cold startup, if you dont get the voltage or dont get the spray, it explains the problem.

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Saumil S. Patel