Do the pontiac Sunfire 2004 have a aux cord in the car?
Don't know. DOES IT? Did your mommy leave one there for you? Maybe you should go look.
You need to examine the stereo to see if it has an auxiliary input. If it does plug in the necessary cord to use it. If none of that, install an FM modulator to the car so you can play your device through the radio, plugging it into the device.
That would be a big negatory good buddy