I had a similar problem on my top swapped grand prix..I regapped the plugs to .43 and it fixed it. Just a thought. Also the regal gs and gp gtps from 97 came with 4t65ehd trans..only the non sc motors in 97 came with the 60..friends regal gs is a 97 and it has a 65..my.moms is a 97 ls with a 60.

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