1992 V6 wont accelerate

hi everyone, i really need some help because my truck will be fine, and then when i'm driven the service engine soon light comes on, and it wont accelerate, a check with the computer and it told me there was a failure with the (MAP) and (TPS)throttle possition sensor, so i replace this 2 a couple days later it did it again, i dont know what to do because the computer reads the same problem. i will really appreciate anyones advice on what to do.
thank you