Hello,
It sounds like you have a vacuum leak to the modulator. There is a vacuum line that runs from the engine intake manifold to the valve. Here is a diagram that will show you the location. Check the hose for leaks and sometimes it just falls off #22.
Check out the diagrams (below).
Please let us know what you find. We are interested to see what it is.
Cheers, Ken
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Saturday, December 16th, 2017 AT 11:30 AM