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I found the vacuum leak. The vacuum tube connecting to the tandem pump had a severe leak. There is a nipple on the corner piece of the tube that provides vacuum to some other component - fuel system maybe? The nipple had broken (I believe before I bought it - used) and resulted in the symptoms posted earlier. It now brakes better than since I've owned the car, and responds well when pumping the brakes.
Whats interesting is the car seems more responsive when I accelerate. That is why I suspect the the tandem pump also provides vacuum to the fuel system. I've read where vacuum issues can result in a richer mixture and degrade overall performance. I've also read it could influence oil consumption. Currently I'm averaging 18.4 mpg and burn a quart of oil every 1200 miles. Any thoughts on my suspicion?
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