Chevrolet Stemm Automatic Box 1998 does not apply

Good night I appreciate help with a problem that I have with my Chevrolet Stemm Automatic Mod Sedan 1998 1.6, which the speed box does not want to apply, or in retro and Dray position. I have already taken it to several diatnostic house, they have made me change several sensors such as the MAP, TPS, butterfly and postering sensor follow the fault. That they suggest or advise me .. I appreciate your help ..