88nissan

ok... i asked before but ppl dint understand, i got a 1988 automatic sentra when i would drive it ,it wouldnt shift but now i figure out it was so cable or something that goes from the accelrater to the tranny how do i take it out is there a clip to take it out caz it goes straight into the tranny and i dont want to open that up maybe someone understand what iam saying and could help me thx you for your time