WEEKLY TV WEEK SEINFELD (NBC) Elaine runs off with Kramer, George runs off with Newman, and Jerry, having alienated every women in the Tri-state area, never leaves his apartment again. FRAZIER (NBC) Frazier and Niles wander into a gay bar and discover a lifestyle with all the trappings they aspire to, but without all the women problems. HOME IMPROVEMENT (ABC) Tim accidentally knocks one of the kids into a wood chipper and must secretly impregnate Jill before she realizes anyones missing. EVERYBODY LOVES RAYMOND (CBS) Raymond fakes his own death and takes on a new life as Marlon Brandos houseboy. MOESHA (WB) Moesha, Twinilla and Loshana sneak into a ChumbaWumba concert with Jarouque, Latreau and Bryn Mawr. COSBY (CBS) Lucas either has a hernia or a bad back, but all the people who keep wandering through his living room don't give a damn. DEEP SPACE 9 (UPN) Worf locks the keys in the Defiant with the engine running.