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Often times, an engine vacuum leak will cause these symptoms. If there is a leak, the most difficult part of the repair is locating it. Once located, simply replace the hose or reconnect it.
Here is a link that explains how to find engine vacuum leaks. Do this and let me know if it helps.
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Let me know the results.
Joe
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Sunday, September 22nd, 2019 AT 5:43 PM