My parents recently began having issues with their car. We live in California, and the car is a 1999 ford taurus with an automatic transmission. The car just hit 100,000 miles and the issue is this: Once they drive the car, to lets say a store, and then come out of the store and turn it back on the car will stumble like it is going to stall and idles VERY low. It does this in Park once the car has been warmed up for the day.