Vibration
#1
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2004 Suburban: I feel a vibration around 30 - 40 MPH. If I let off the gas, it goes away. Heard a clicking noise a couple days ago, but have heard it since. Maybe drive shaft or u-joints?
#5
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sounds like you're chasing a few problems at once or just not thorough in your posts but yes if your fuel pressure/volume are ok and you have both banks lean theres a good chance you have a vacuum leak...probably intake manifold gaskets
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