2006 Porsche Cayenne Turbo sometimes refuses to go in reverse or drive when cold-starting. Starts workingafter a few seconds. Also, when going low speeds (like pulling into a parking spot) it makes a rough noiseaccompanied by a noise that sounds like a duck. Check engine light is on. I’m about to replace the sparkplugs and coils, as well as an oil change. Any other ideas on what I could look at?