MY 98 Malibu is also having these issues. I have a P0171 code (the fuel system for bank 1 was too lean). It could be the MAF sensor, oxygen sensors, plug wires, fuel injector cleaner, vacuum leak, ignition misfire
What should I do?
1) Pay for a $60 diagnostic test to hopefully accurately diagnose the problem.
2) Replace the 2 oxygen sensors and hope that fixes the problem
Thanks.