I have a 2000 Mercury Cougar that is having electrical problems. The problems were flickering lights throughout the car (dash lights, headlights, reading lights, etc.), a battery warning light going on and off and the sudden loss of power at freeway speeds. I took it to the dealer who replaced both the battery and the alternator. Within a day, the lights again are flickering and I have lost power again (for a very short period) while driving at freeway speeds (happens every now and then). The flickering is the most pronounced at lower level speeds and when you are driving at high speeds and take your foot off the gas and let it gradually slow down. Also, the lights do not flicker when the lights are on and the engine is not running. My guess is that whatever is causing the electrical problems is also causing the engine cut-outs (maybe the power to the electronic fuel injectors is temporarily cutting off). Any thoughts on what the problem (s) might be? Thanks.