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have your obd II CODES READ this will give you more of an idea what is going on with it. most auto parts stores read these codes. If you are smelling rubber check your serpitine belt for where and if it looks good take the belt loose and check the rest of the components that the serptine belt runs on altinator, water pump,powersteering pump, pully tensioner, other pullys ext.
Sounds like your O2 sensor is malfunctioning. When the check engine light comes on, the computer goes into a preset mode bypassing the O2 sensor and that's why it suddenly runs good. Have the O2 sensor checked. You can also have the trouble codes read and they should point you in the same direction.
Take out the air intake tube that goes to the throttle body and start the car. Now have someone hold the gas peddle so the engine stay at 2500 rpm get a can of carburetor cleaner at your local parts store and spray into the throttle body. Car may shut off start it back and repeat process until half of the can is left. reset engine light
I hate repeating myself, but here goes... Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there. So, check for codes... let us know what you find... we can go from there.