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  1. Chevy Suburban Forum (GMC Yukon XL)
    Please Please Help.. 1999 Suburban K1500 LT 5.7 Vortec with the newer Spider style. Completely Stock other than added a second battery with a relay. Background: Fresh Rebuild after previous head gasket and 2 cracked heads. Issue: P0134 P0154 and seem to be in Open Loop all the time...
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