Hi folks. I've gone through the vacuum lines and replaced anything questionable, replaced plug wires/rotor/cap, replaced fuel filter and I'm still experiencing an annoying reduction in turbo boost as my 850 wagon warms up. For the first 5-10 minutes after a cold start the turbo produces a tremendous amount of boost and the car runs extremely fast, then as the car reaches a steady normal operating temperature the boost becomes variable and is greatly reduced. I'm guessing there may be some issue with the boost controller or a faulty temperature sensor (since it seems temp. related). Any one have an idea of what could be wrong or been through a similar situation? Car is relatively low mileage - 80k.

Thanks for any helpful hints... I'd love to have the power all of the time!