Chevrolet Repair: Truck not running when hot, throttle position sensor, mass airflow sensor

Question
I have a 1988 4X4 Chevy 1500 with a 305. The truck will start fine when cold and run for about 5 minutes. Then is dies as if losing spark, but the spark is there and tested OK. it will restart when holding foot to the floor, back fires and black smoke. if I let it cool down 100% it will repeat. I was told it can the Electronic spark control, what do you think  

Answer
Hi Robert,
It is probably electronic, but I would suspect the mass airflow sensor, or the throttle position sensor, although there are several more possibilities also.
Don't just run out and buy those things. Get hold of a Motors, or Mitchell manual, and go through the troubleshooting chart.

Van