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The CTS manual is at the attached link. http://www.2008cadillaccts.com/2008-Cadillac-CTS_Navigation_Manual.pdf The dts manual is at https://my.gmc.com/content/dam/gmownercenter/gmna/dynamic/manuals/2008/cadillac/dts/2008_cadillac_dts_navigation.pdf
A bad fuel pump, poor power or ground to the fuel pump, a bad MAF sensor, A bad coolant temp sensor, a large vacuum leak, an upstream O2 stuck rich, A plugged fuel filter, or dirty injectors to name a few.
Is there a check engine light on? How do you know it is not getting enough fuel?
It most likely doesn't have one. A lot of newer cars are no longer coming with them. If it would have one it would be near the tank on the pressure side of the fuel line. If one can't be seen than it most likely don't have one.
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