I would buy some carb cleaner and spray it around the places the intake manifold fasten together and to the heads. My guess it is one of the really thin gaskets that are used there. I have had them act like the blade of grass between your thumbs when you blow across it. when the metal is getting warm it is closing the gaps. You might just want to try to tighten everything that looks like it is fastening the intake to the heads and to itself. if yours is only happening when cold.....you probably don't have a lot of time to spray cleaner around. good Luck
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