Okay, I recently dropped my old transmission and replaced it with a new "used" one that has been modified or had been overhauled...It worked fine until last month...I had to take it to a mechanic because I didn't have a place to do any of the maintenance to it...now, she'll start...but won't drive an extended amount of time. (she'll drive until I apply the gas for an extended amount of time...she'll only go SLOW and I can't do that on the freeway!).. I think one of the "sensors" was applied wrong, or there's something else that I have no knowledge of... I'm perplexed....Any answers are very appreciated at this time.

Thanks

 

Could be bad shift and torque converter lock up solenoids. I just bought new ones that came with a new pan gasket from Ebay. Mine is a AW4 trans.