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11-05-2011, 10:34 PM #1
- Join Date
- Apr 2008
Weird "grumble" noise at part throttle...
So my 99 5.3l Sillverado has a grumble of sorts at part throttle (about 5%). It kinda sounds like an exhaust leak but it goes away once I actually get on it. Almost feels like a tranny issue but sounds like it's coming from the engine. It does have a slight manifold gasket leak but I think it's unrelated.
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