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06 STS V-6 engine issues....

2K views 3 replies 3 participants last post by  Cadillac Customer Service 
#1 ·
The other night on my way home, running about 55mph. I decided to drop the hammer. When I had to stop at a light, the engine was idling rough and missing. No dummy lights came on. Only a few blocks from home, so I continued to drive home. As I drove in drive way, engine was running normal. Has not duplicated since. This morning I had a low coolant light. I had a low coolant light a month ago and topped off then. I've owned the car over a year now, and been running like a champ. So now two coolant light and less than a month. Inspected engine/radiator/hoses and can NOT find a visible external coolant leak. Do I have a head gasket going bad? Also not seeing white smoke out the tail pipes.
 
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