Sound like you have a vacume leak or intake leak that cause the rpms to go up and down and it will run rough it will also cause you to smell gas
Most likely faulty 02 sensors. They tell the computer how much gas to give the car. A faulty camshaft position sensor may also act this way to. You can check sensor with an ohmmeter and check that there is an electrical flow through the sensor.
MAP SENSOR CAN ACT UP ,TURN SWRTCH ON AND OFF THREE TIMES TO GET CODES OFF DASH , IF YOU GET A CODE 14 CHECK YOUR MAP SENSOR
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