Answer

Hi, Trevor here.

I woudl suspect you are having a fuel problem. I would suggest you test your fuel pressure. Also you can try the on board self diagnostics on the cadillac it may point in another direction to look. Let me konw what you get and we can look up testing for the components related. Also let me konw what you get for fuel pressure and we can see what needs to be looked at there too.

Cadillac BCM and PCM Codes and Diagnostic Procedures

Diagnostics Basic Operation

Step	Action
1	Enter self diagnostics by simultaneously pressing and holding the "OFF" and "WARMER" buttons on the Electronic Climate Control panel until the automatic segment check begins.
2	Malfunction codes are displayed in the following order: ..- ECC current codes ( parameter number -00 ) 1..- ECC history codes ( parameter number -00 )
3	To select a specific parameter, press "HI" to increment and "LO" to decrement the parameter number.
4	After the status light display begins, ECC error codes are displayed. PCM codes may be displayed by selection parameter -01 and then pressing the "OUTSIDE TEMP" button.
5	Exit diagnostics by pressing the "AUTO" button
6	Pressing "OUTSIDE TEMP" switches between parameter number and parameter data
7	To over-ride a program number, while in program number display, parameter -11, pressing "WARMER" or "COLDER" will increase or decrease the program number.

Hope this helps. If so please click accept. If not then please let me know and I will try to help.