I have the same car is the check engine light on if so have code pulled at auto parts store theres alot of sensors on the car theres a throttle postion sensor the car controls the rpm the computer sends signal to sensors if sensors are starting to go bad rpm will go up and down if the car finds a error in itself it will send a code to the computer of car causeing the check engine light to come on the car stores a error code until problem is fixed if light isnt on then the fuel injectors may need cleaning if its just a random thing its gonna be hard to detect until car stores code good luck
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