Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is Bobby. Thank you for the question. The most common cause of this on your vehicle is a vacuum leak. The most common leak I have found it the intake manifold gasket. When the gasket has a small leak this will cause too much air to enter the engine which causes this high idle. I would have the engine checked for this. If it is fine then the throttle itself may be failing and not closing properly or the throttle position sensor is not reading correctly.