What does it mean wen my 91 Pontiac grand prix se cranks up in morning and after i drive it for about 30 mins and cut it off and go in the store and come back out and try to start it it just spins?

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What does it mean wen my 91 Pontiac grand prix se cranks up in morning and after i drive it for about 30 mins and cut it off and go in the store and come back out and try to start it it just spins?