Quote:
Originally Posted by MBeige
Could be a vacuum leak, or a clogged line. Clogged line would restrict flow so the response might not be as quick as the other one.
When you pry it out clean it thoroughly inside. Brake cleaner comes to mind. Of course clean it when it's disconnected from the car.
Then replace the two rubber ends with fresh ones. Not sure if the gauge has any corresponding values to it, to me it seems more of a qualitative gauge indicative of whether you're getting good or bad MPG. As long as it holds vacuum I would think you're fine.
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Gauge reads about 15 - 0 vacuum...
If the OP installs a test gauge at the manifold port he'll be able to determine if the problem is in the line or connector to the gauge.
If the test gauge remains low under throttle change then there may be a vacuum leak.