Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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There are 2 bulletins released on this year and model for this fault.The first is loose spark plug wires at the spark plugs.I would go through each plug wire and make sure they are seated properly.If this is o.k. the other issue is carbon build up on the valves.In this case a carbon clean needs done usually with a machine to correct this fault.
I dont suspect this is a motor mount issue as this is a fairly new vehicle but you can have them checked to see if any are worn or collapsed needing replaced to resolve this fault here.
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Usually it isnt with low mileage like this but if it is driven in town at low speeds with allot of stop and go driving it is possible that the issue is carbon build up.
I would check the plug connections and if found to be o.k. then it would be a good idea to have the mounts checked for any issues.
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When put in gear this puts a load on the mounts and spark components as the transmission is then engaged to the engine.So it can still be either of these as the cause here.
I would have these checked to see if the fault can be pinpointed.
You can try it if you want but if this is under warranty still I recommend allowing a dealer to re check and repair this under warranty at no charge to you.