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A check for a vacuum leak is never a bad idea. If the engine does run OK after a minute or two, I'd think it's not caused by a vacuum leak though, because if it was causing these problems, it would never really clear up. Unless it's just leaking vac when the engine is cold.
However, one thing I just thought of, is that a bad OVP or even just a blown OVP fuse causes bad cold starts. Not as bad when warmed up, but they do start and run poorly when cold with an non-functioning OVP.
Gilly
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