I've been reading a bunch of stuff about lean conditions, detonation, destroying internal engine parts, etc. If this is occurring out there, how come the ECM's aren't throwing lean burn codes, etc. before it gets to this point?

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Mysterious/Ebony
Vin # 9126
DDM Stage II, DDM Pro-Beam, High Flow Cat, KS1, Lil Chromies, 5" Stubby Antenna, Black Center Wheel Caps, Dimming Home Link Mirror
Fully Loaded Except for XM and On-Star