2002 Ford Ranger

Latley my truck, after going about 15 minutes and sometimes after I idle my truck we just die on me. It happened first when I was sittin at a red light and it turned green, I hit the gas and nothing happened. So it tuck me about 9 times and I finally got it cranked. So about 5 minutes later I was pulling in school and it died on me again, That time it only took about 2 times to crank it. So we took it to the shop and they replaced the belts on it. So about 5 days later I was driving it, I had been idleing for about 2 minutes and I started to go again and as I started to slow down it died again. Some people say the iac and some say it might be a sensor. So what do yall think