1993 Range Rover 4 cyl Four Wheel Drive Automatic 113k miles
93 Range Rover, LWB count, 4.2 Buick engine. MIL caused smaog failure. Engine tested clean ran fine but in Ca MIL is automatic fail. Replaced temp sensor and air enrich solenoid, both EGO2-no help. Purchased used computer MIL. Engine began to run rough a wk later. Low power back fire through induction system( similar to lean carberator conditon) Replaced fuel filter-no change. No idea about how/where to test fuel pressure. Maybe it's computer/fuel delivery related. Can computers be repaired? Replaced air suspension with spring it didn't disconect suspension computer.