starting problem

have 1992 g20 with 77k, auto trans, sr20de engine. must pump gas pedal to get it to start. it idles and runs, but is sluggish and exhaust smells like gasoline. check engine light is not on. cap, rotor, plugs, dist, filters, are all good. will restart immediately after turning off ignition, but if i wait five to ten minutes i have to pump gas pedal again. any ideas?