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Q: my car shakes when cold on 2004 Cadillac DeVille

i have a problem when i start my car when it is cold. It shakes/vibrates until it warms up, but it still shakes but a little less.
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Is there a Check Engine/Service Engine Soon light on? If so the engine may be suffering from an ignition or fuel related misfire. If the Check Engine light/Service Engine Soon light illuminates while you are driving, the car's on board computer sees a fault in the engines management system that is causing an excess amount of pollutants to be emitted from your car. This could result in engine damage if left neglected. Some problems that can cause the Check Engine light to stay on may take two "drive cycles' to complete before illuminating the Check Engine Light. The computer sees a problem and looks for an identical set of circumstances to occur to confirm that it has indeed seen a problem before turning on the light. A Check Engine light that continually flashes while you are driving is serious and is a sign that the computer sees a problem that seriously risks damaging the catalytic converter which may result in an expensive repair or even may cause a fire! Diagnostic codes are stored in the vehicle's computer and can be retrieved using a scantool that communicates with the computer in your car. We have in our Repairpal website an encyclopedia with in depth articles about computer, and computer control systems, emission and driveability problems.
when you talk about this shake when the engine is cold does it constantly shake or would u say its more of a loop? Does it shake then stop and shake and stop again. If you want to locate the source of the shake/vibration i recommend using a small vaccum hose to isolate the sound.
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