My car will not come out of high gear. Ive out a new
transmission moduel and i heard it could have to deal with my vaccum but i dont know were that is can some one give me so seggestions please its my first car....

Optional Information:
1990 Eagle Talon 2.0liter- engin

Already Tried:
ive replaced the transmission and the transmition moduel ive took it to 2 diff machanics bolth told me it was the model before looking close to it...