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View Full Version : Opti Spark Vacuum lines



barno68
03-06-2007, 12:28 PM
I am trying to figure out where the two lines go. One has two check valves and I have it plugged in to the manifold below the throttle body. The second was cut, so I am unsure where it goes, if it needs a check valve, or if it is a vacuum line or a drain. Any help?

Brent