car dies.

my buddy has a 93 integra and he had a code for his 02 sensor. he replaced the 02 sensor and now the car will randomley die out and then will not start. but if you wait a minute it will start up, then it dies out later while driving. if anybody has any info that would be awsome. thank you

i forgot to mention, he put a new distributor and plugs and wires. so if that adds anymore info then i hope it helps.

i just replaced the fuel pump in the car, and it was fine for a bit. and now it wont start once and awhile. so could there be something wrong with the wiring or fuses?