2003 GMC Yukon 5.3L, Lean trouble codes P0171, P0174, P0101 and P0300 are setting

download 2001 Chevrolet Suburban 1500 5.3L 2003 GMC Yukon 5.3L, FLEX, Vin Z 2003 Cadillac Escalade 6.0L, Vin N, 2003 GMC Yukon XL 1500 5.3L, FLEX, Vin USA/Canada Z 1. Check for leaking intake manifold seals around the intake ports. The intake gasket seals may be leaking around the intake ports, causing a lean condition. [...]