Question about 1991 Cadillac DeVille

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1991 deville codes

I had my car inspected and it came with these codes 25,34,33,31,45,& 61 can anyone tell me how to fix as I have a limited budget.
Thanks

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1991 deville speedometer jumps from 0 to 40 sporadically and fuel data center bounces between option (avg., miles to empty,fuel used) even though the fuel level shows correctly. change oil light comes on...


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