Hi guys i would like to say hi im new user i hope to be a long user of this forum well here is my issue. Iown a 90 ls400 that has me confused if i disable the o/d button the car pulls as i i were letting go off the gas pedaland stepin ont it again rpm gauge moves up and donw and speed lowers alil bit. It does this at arround 35mph if o/d is enabled it does this arround 60mph. Its really annoying im not ure if its a transmition speed sensor wich im 70% thingking it is or a fuel issue filter,injectorsor fuel pum thats my 30% iwouldjust need your feed back on what might be the problem i will post a vdeo of the car doing its shinanigans any hel is apreciated sorry about ma grammar

 

Why not just leave it alone in the OD mode? What are you trying to accomplish? Sounds as if it's functioning properly.

 

I don't quite understand what you're trying to say.....

I don't see why you would take it out of O/D anyhow. I only do that when I'm going down some SERIOUS inclines and don't want to wear out my brakes.

 

its Not about the over drive i have an issue with,its about how the car pulls when i reach a certain speed when over drive is enabled On my car http://youtu.be/3fERwrR8CL4wathc this video and look at the rpm gauge

 

first welcome aboard, glad to have a new owner..... now:
you dont need us guessing at all the things that could be causing the tack to be that way.... take it to a professional and see what they say and then let us know and we will try to help you.. save some money..

 

The torque converter is not locking up. Your overdrive selenoid is malfunctioning. Have a tranny shop do a check on this. I had this happen on my aurora.

 

I've taken it to a tranny guys he said its fine the car feels like if i was letting go of the gas pedal and then steping on it again i will take it to get it checke out thanks for the info any good site were i can get cheap parts

 

just do a search