I have a 1995 Lexus LS 400 with 185K miles. The car runs beautifully except for one problem. After the car is driven at a continual sustained speed above 55 mph for greater than 15 to 20 minutes, when you slow down to a near stop or stop the car will stall. Once you place it in neutral or park and restart the car everything runs well until you repeatr the sustained speed routine. So running around the city is not a problem, but when you are on a trip, even a short one, it is a major problem when exiting the expressway or interstate. Repeated attemps to have the dealer diagnose have met with they find nothing wrong.
Please help