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Quick solution if you can't get into the dealership right away....goto your nearest Midas or a Car X or something like that & have them take a look at the underside. See if they can find anything & if so, just how bad is it & if it is safe to continue driving.......
It is hard to say what it is unless I was able to drive it or do a ride along.
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2003 TrailBlazer EXT 4X4 NorthFace Edition. Silver Green over Pewter 
Every option minus the DVD 4 a MoonRoof.
5.3 V8 3.73 Locking Rear.
Performance:
TrueFlow Air Intake
Granatelli Mass Flow Air Sensor
FlowMaster 70 Series SUV Muffler
Predator Power Programmer
Airaid Throttle Body Spacer
Misc.:
Super White headlights 80W & 100W
Fog Lamp bulbs
Billet Grill
XM
Tekonsha Prodigy Brake Box
Valentine 1 Radar
Line Of Fire 49" L.E.D Brake Light
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