cox

Need help urgently!! While I drove to work, the engine started rumbling after 15 minutes at 80km. Then the engine lost power and I had to pull aside. After waited for 1 minute or 2, the car ran again (without shut down and restart the engine). This problem happened about 6 months ago and just a few time over this 6 months period. However, this happen every day recently especially in the wet weather. I took the car to the dealer for checking. They checked the fuel pump and found that the pressure was OK. The gas tank was fine. Then they switched the relay as well. At the end, they still did not find out the exact problem even using their computer to diagnoize (because this problem did not occured during their test drive). Any advise how to fix it is much appreciated.