S light screwing me over

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calmfornow

System Failure Racing
hey, i got a normal problem iguess but i dont know how to fix it. my uncle soldme his 91 2 door EX automatic. He had problems with the "S" (sports) light stayin on, and it is stuck in fourth gear, unless i put it down in 1, and then it is in second. I know it could be the TCU or the lower shift solenoid. I just figured i would ask for an answer. I also do highway driving so this problem really sucks.
my uncle said he took it to a shop and they got a code 1 and 8, but idk. and if i diconnect the lower solenoid the s light blinks and is still stuck in those gears, but reverse also works....please help
 
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