As stated above my brother gave me his 2002 xe sentra. This is my first car and i dont really know too much about cars. Within two days of having my "new" car, when i start it it would idle fine then a couple of seconds later the idle would drop as if would shut off but a second later it rises back to normal idle. This would continue throughout the day of use and its still happening today. Whats wrong and how could i get this fixed? Im new to cars and your help would be greatly appreciated. Also on that note my brother told me to replace the tail lights because someone cracked both of them. I was wondering if the 2005 tail light would fit directly on my car without modifications? My friend got into a wreck and totaled his 2005 sentra and said he would sell his tail lights for cheap to me but i asked if it would fit mine and he didnt know. Please help me and thank you again?