If it occured with just the VCP, then there is a tracking problem... since it seems that it occurs with both the VCP and DVD then I think there may be feedback from the idle unit while the other is operating...
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2002 EXL-RES Redrock Pearl
2001 Chevy 2500HD crewcab 4x4
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2002 EXL-RES Redrock Pearl
2001 Chevy 2500HD crewcab 4x4