91 Blazer shuts off while driving

My 1991 Blazer has shut off 4 times in the 6 weeks while moving. Sometimes the engine shuts off completely or seems like the it just stops getting fuel because the engine revs but doesn't move. This has only happened since the radiator has been replaced whatever or not that has anything to do with it. After the Blazer shuts off, i manage to make it to the side of the road out of the way of traffic and try to restart it. When it starts up the Service engine lights comes on and when u hit the gas it moves but almost as if the engine is in a lower gear. Ater a few times off pulling off to the side and leaving the car sit off for a few minutes it seems to be fine till a few days down the road.

My 1991 Blazer has shut off 4 times in the 6 weeks while moving. Sometimes the engine shuts off completely or seems like the it just stops getting fuel because the engine revs but doesn't move. This has only happened since the radiator has been replaced whatever or not that has anything to do with it. After the Blazer shuts off, i manage to make it to the side of the road out of the way of traffic and try to restart it. When it starts up the Service engine lights comes on and when u hit the gas it moves but almost as if the engine is in a lower gear. Ater a few times off pulling off to the side and leaving the car sit off for a few minutes it seems to be fine till a few days down the road.

might whant to check your trans. fluid it could be low if you have a cooler in your radiator

done a tuneup lately?