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OK,
Noise in cabin at idle driving my saving to zero,
Dealer cannot locate,
Sitting in drivers seat there is audible INTERMITTENT popping.
goes away beyound 700rpm, i think or the engine noise drowns out,
1998 5.4L 92K pampered,
Gibon Cat back,
Kenne Bell SC (disconnected the SC) sound still evident,
Trucks performance does not seem affected.
Ideas?
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