94ChevyBlazer4.3 vortec

These are all lean running codes. Check for a vacuum leak from intake to map sensor and if a tbi unit check for a blown gasket under th tbi unit. Also check for a O2 sensor wire touching or burnt through on the exasut manifold. There is no code 59. These could all be related however. Also check yoru fuel pressure if it's tbi then it's 9-11 psi.