Vac line
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Couple of methods, with engine running, pull and replace vacuum lines one at a time, whichever line makes NO change while in plugged is the bad one. Other method involves a can of carburetor cleaner, make sure it's NON-CLORINATED. I fondly know if you can even get the chlorinated stuff or not but make sure it's non. With engine running, spray connections of vacuum lines and anywhere you think is suspect. Idle should come up when you find the bad spot. Make sure to check the Pcv hose. It's a black line running from the back of the drivers side valve cover, around the back of the intake manifold, up the passenger side of the intake manifold and goes in. The 90* rubber elbows on the ends crack.
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