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89 gt help

  1. 89 Mustang GT tranny and spark plug question

    5.0L Tech
    I recently bought an 89 GT, its an automatic and it shifts kinda funny. From take-off its cool but then it shifts way to fast causing the motor to bog down and I know it shouldnt be like that. I dont drive in over-drive unless on the highway or interstate, I keep it in drive or sometimes shift...