I had a situation with my 02 Optima running lean and sometimes run really rough and die at an idle. I disconnected the Mass Airflow Sensor and it ran closer to normal (disconnecting will give the computer a "default" code but may quiver when taking your foot of the gas) I replaced my mass airflow sensor and took off the catylitic converter and the car runs and performs better than before I had the problem. It still passed a smog inspection in California
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