At odd times my Kia stalls out when traveling 60 miles an hour. on 1995 Kia Sportage

also stalls when down shrifting, but this does not happen regularly. Could travel over 500 miles and nothing. engine light will come on briefly, but hen go off. Mechanics say the light must stay on for them to find problem. I need help.

2 answers
check fuel pressure
scan for codes and post so we can adv