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There is a warm up valve on the throttle body(should have 2 small coolant hoses). remove the valve and have someone start the car while you block the port to the valve on the intake. If that clears up the problem you can cut a piece of cardboard to mount in between the valve and intake.should straighten it out.
if you go to your local autozone, o'reily, or advanced auto and tell them what you need..a ported vaccum switch they will sell you one and most of the time you can take that and look at it and tell were on top the motor it goes.. i have a 1990 3.8 good-luck ray