1994 z28 has service eng. Fault-scan indicates leaning out on left bank (driver's side)-any ideas on remedy for fault?

 

Please post the exact trouble code when you are asking about them (and please put something meaningful in the subject line). You might have a bad O2 sensor, O2 wiring problem or even an exhaust leak.

 

Or.... it might actually be running lean due to low fuel pressure, incorrect injectors/programming, faulty MAF sensor, large leak in the elbow between the MAF sensor and the throttle body, massive vacuum leak, etc.