try checking your catalyctic converter
A failed computer is possible, It could also be the cluster, wiring, ignition switch, etc.
Check plugs and plug wires---worked for mine.
Your 1991 4.3 S10 starts for about 3 seconds then shuts down because it is faulty. Take it to mechanic to have it checked.
My wife's car does the same thing. We have narrowed it down to a worn ignition switch.
if no warning and it just shuts down but dash lights and radio light up check ignition switch
You need to have your check valve replaced.
sounds like ignition module. Check for spark while cranking engine when it decidedly shuts down on you.
Your problem is the chip in the key or the ignition. Try your other key before doing anything else.
Duke's. It shuts down and he starts going to McGinty's (sp?)
computer doesn't meet the requirements.
Could be as simple as a clogged fuel filter.