97 astro stalling

97 astro 4.3 w eng had stalling problem back in april,posted here go reply from oldmaster checked fuel press .had slight leak down ended up replacing fuel press reg now holds pressure.everything seemed ok for about 3 weeks , we took a short trip about 50 miles started stalling at traffic lights,cycled key off,cranked back up ,ok until next stoplight.i also noticed oil press about 15 psi at idle .i read in hayes repair man. that fuel pump is controled by relay and oil press sensor.test for op sender was to start eng pull relay and eng should stay running.my eng would stall replaced sender now its working the way stated in repair manual except now i notice when i shut the key off fuel pump stays running for approx 8-10 seconds is this proper operation?? thanks in advace Bob

p.s.- after oil sender replaced op at 40psi idle,60psi going down road