I changed the intake and injectors on my 94 nissan which improved the performance 90%,, it has lots of power in 1st and 2nd, but when it shifts into drive,, it bogs down,, till you get up to 60plus and is in overdrive.. after that if you go to pass and it kicks down it has plenty of power, its just from 35to 60 it has nothing any ideas on what the problem might be? thanks for any help