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05 lly, 174k miles, k&n cold air intake, diablo predator, and just put in the ppe fprv shim (which fixed my previous problem). But now, If I'm stopped at a red light and I turn the radio down, I can hear it idling weird. It'll go upppp, then lowwwww, upppppp, then lowwwwww, and so. like it isn't a constant hum. Its more of an up and down kind of thing. any ideas?