My 1998 chevy blazer started loosing power one day and eventually died. When it died the battery was dead. I replaced the alternator thinking that was it. It will crank, looses power and dies and then battery is dead. Had it towed to machanic who told me the engine was shot.
Need a new battery first, or charge the battery...if the battery is over 3 years old, I would just replace it, also may need a higher output alternator with more amps, to run the electronic fuel injection, fuel pump, and ignition etc...
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Multiple possibilities. Will start with easiest/cheapest. You don't mention check engine light (that would give codes), so I'll go with the same issue we've had with newer Blazers. That would be the ECM in the distributor. When ours started going bad, it would cut-off intermittently. Well one day the intermittent was terminal. Anew ECM, for the 2.8 V6 (1987) is approx 45.00. You would have to price it for your vehicle based on year and engine size. The worst case scenario is loss of timing gear. (That happened on our 67 Buick with 300 V8). Another thought is what happened to a friend. He's putzing on down the highway when his 88 Pontiac Grand Am simply quit. His computer had bit the big one. Those are the only things that come to mind, other than running out of gas or your alternator had quit charging your battery and the battery finally lost enough power to spark the plugs.