Listen for the manifold leak through a few feet of 5/8" heater hose, using it like a stethoscope. Pass it around the headers and flanges at idle. You will be able to pinpoint the leak to the exact location.
Do you have a Scanmaster, and if so display the numbers for us to see, and if not get a Scanmaster, it's one of the easy and common diagnosis unit to have.
Do you have a Scanmaster, and if so display the numbers for us to see, and if not get a Scanmaster, it's one of the easy and common diagnosis unit to have.
definitely get one as soon as possible as the Scanmaster can help you to troubleshoot instead of guessing.
Here is the Scanmaster manual and also another great site with more info of the Scanmaster function. http://www.vortexbuicks-etc.com/Scantool_Readings.htm