1994 caprice stalls when i put gas in
 

i have a 1994 caprice lt1 i put new pump and sending unit in new filter. it stalls after i put gas in it now it does it all the time. i might go 3 miles and it acts like its out of gas and stalls. it takes 10 to 15 min and it will start up and it did this before i put the stuff in the tank to so it was not that.and if i give it gas it stalls