1991 Calais

1991 Cutlass Calais 2.3L automatic. Wont start after running for a while. Can sit over night, start right up. Go to work in the morning, its alright. If I run to the store, run in for 5 to 10 minutes, come back out, it turn over. Will start with starting fluid, but i hate to keep doin that. Any suggestions would be helpful.

Have your catalytic converter checked my car did the same thing a few years ago soon as it was cut off ran fine.

Had cat converter checked. No obstructions. At my wits end. Anybody have any ideas? Sometimes it wont even start with starting fluid. Any help would be appreciated.

same thing happened to mine, i changed the whole coil pack and had new plugs and wires put in, now it runs great.