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2G Weird sound coming from under intake manifold

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Ivan Garcia

Probationary Member
16
1
Apr 3, 2019
King City, California
Hi y’all! First time poster. I have a 97’ GST making a WAP WAP sound under the intake manifold when only in drive. Sometimes goes away with RPM. No power is lost just sounds pretty bad. Any idea what it could be?
 
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