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I have a 1992 coupe with an LT1 motor, all stock with about 62,000 miles on it. The problem I am having is after the engine gets warm the "Service Engine Soon" light will come on for about 2 minutes then turn off. I checked the codes and got a 63 and 64, which was lean right side heated 02...

I have a 1992 standard coupe with an LT1 motor, all stock. Any ideas on what would cuase a hesitation in throttle response at low rpms? I have replaced the TPS already, as well as cleaned the idle air control valve/motor. The hesitation does not become noticeable until the engine reaches...