i know autozone will turn off the check/clear the code. Plus i'm sure they have the chilton manual for your car.
Another thing i thought of is, there might be a "oneway" check valve in the vacuum lines. Just trying to think back 4 years ago when i had brake problems on a street/strip car i had. I had a radical cam, which produced low vac, and my brakes sucked, and it too would almost kill the engine. So i bought a vacuum canister, hooked it up the opposite way and the brakes were overly stiff, flipped it around, and the brakes were great like before the rebuild.
IDK thinking out loud to see if i hear something else
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Randy
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