1996 Toyota Camry Intermittent running and hard starting

For the last few weeks the car will start in te morning and occasionally have a rough idle, it will stall at stop signs or just lose power when slowing down for a turn then stall. Sometimes will immediately restart, sometimes it has to wait 5 inutes to restart. Occasionally smell gas and has backfired. Recent repairs include timing belt chang, plugs, wires cap and rtor and the fuel filter. Could thid be a feul pump or fuel pressure regulator. I know where the fuel pump is butwhere is the regulator?