i have a 89 iroc tpi the car will run great for about 15 mins till it warms up and then it will stall if you drop it down to below 1500 rpm and will not start till it cools down again after it stalls it will try to start once but will not start and then after that it will crank and crank but not even try to start then after it sits and cools down it wil start and run great for another 15 mins the car gets it i just wish i could drive it for more then 15 mins at a time any ideas on what the problem is and any ideas how to fix it thanks guys

 

My guess would be o2 sensor. Does the service engine light come on at all?

 

Check your maf as well