Car stalls...?

ok this has happend a few times. i have been driving and then all of a sudden the car just dies. loses rpms and the speedo and rpm gauger just drop. after a lil bit of messing with it it started back up. it happend a agian and i had to start it with popping the clutch. then again it happend and tried to start it by popping the clutch but it didnt work, so i tow it home and think ok it should start with popping the clutch, but it didnt so i thought ok no fuel...? so i replace the fuel pump. runs better than b4 and starts with a better idle. after about 3-4 weeks of no stalling just again yesterday it did it again, so i think ok maybe its overheating..? so i let it sit in the shade for 10 mins thinking (to cool it) and then after that it starts back up again? im so confused on what it is but im thinking something electrical? or would a bad o2 cause this? im lost please help.

ok this has happend a few times. i have been driving and then all of a sudden the car just dies. loses rpms and the speedo and rpm gauger just drop. after a lil bit of messing with it it started back up. it happend a agian and i had to start it with popping the clutch. then again it happend and tried to start it by popping the clutch but it didnt work, so i tow it home and think ok it should start with popping the clutch, but it didnt so i thought ok no fuel...? so i replace the fuel pump. runs better than b4 and starts with a better idle. after about 3-4 weeks of no stalling just again yesterday it did it again, so i think ok maybe its overheating..? so i let it sit in the shade for 10 mins thinking (to cool it) and then after that it starts back up again? im so confused on what it is but im thinking something electrical? or would a bad o2 cause this? im lost please help.

I assume you're popping the clutch because the starter isn't working at that time? If so, I would check the connections at the battery to make sure that they're clean and tight. And check the negative side to make sure you're getting good grounds.