Sometimes the engine idles rough, though not always, and the seat belt covers have come loose on each side of the front seats.
So far I am pleased with the vehicle. My last car was a 1994 SLS. I was satisfied enough to buy the STS and so far it has been a joy to drive. My wife is small and finds the seat adjusts enough to fit even her small height. Visibility is excellent.
Rough engine idling comes from water in gas, or impurities in gas, too.
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