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Q: why would car run a half hour then stall on 1991 Buick Skylark

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
runs fine awhile then it just stalls have to let it set about 15 minutes then it will run fine for a few then stall again
(3) Answers
Im having same problem. Research is telling me its either crankshaft or head gasket. Let me know which one you do/did and if it worked