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To KJShover: My hose is connected exactly as your photo shows. Attempting to install a Dyna 3000 and using the indication LEDs on the Dyna pointed me in the correct direction to find the MAP plug wired backwards. There was absolutely no indication that anyone had previously modified the plug...

No, vacuum hose comes from the #2 intake manifold on my bike. #2 cyl being front left by my book

MAP= Manifold Absolute Pressure. Does not effect Boost. Adjust timing by sensing manifold pressure. Boost sensing uses RPM and still worked fine when MAP wired incorrectly

1985 VMax purchased from my cousin Walt w/abt 35K mi on it in 2007(?). Ran good at high speeds or wide open but poor gas mileage, and backfiring and running rough at low speeds. In Fall 2011 found MAP sensor plug wired backwards with sensor output where +V should be & vise versa. Appears to have...