SOURCE: Need to replace water pump on a 03 Cadillac cts I
I do not mean to be hurtful and it will take some time to do. Maybe all day if you have no experience. If you need instructions just maybe you should have some do it for you.
SOURCE: My 2004 CTS 3.6L idles
The problem you are having is most likely related to a failed/leaking vacuum operated power brake booster diaphragm, the resulting vacuum leak is making the engine rough rough, I also assume you have a yellow Check engine light on in the dash correct? It has nothing to do with the ECM (which is really called the PCM which is short with for Powertrain Control Module). I suggest you have the brake booster inspected for the leak I think you have to confirm the problem, the symptom of a failed vacuum brake booster are a hard brake pedal and very hard to stop the car. See picture of booster below, it is located under the hood on the firewall to the rear of the brake Master cylinder on the drivers side.
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