I have the 98' Duratec and for the past month I have no power on take off. After numerous trips to the stealership they can't diagnose a problem. After many days of troubleshooting and observation, this problem only happens on hot days (AC on) when the outside temp is above 85. In stop and go traffic I can accelerate moderately and once the car shifts to 2nd (auto) there seems to be no power. The RPM's stays steady (i.e. on 2000) although I'm pressing down harder on the accelerator. Also, the car surges as it is trying to pick up speed. It will finally take off after some hesitation. If I floor it, the car takes off like a jet. There are no other problems. Idles fine, runs great at highway speeds. However, it seems that my MPG drops drastically when this is happening. I'm stumped!!