Relearn TPS with obd or by counting seconds. unplug speed sensor and drive it. But you need to clear fault code first.

Rare fault this so do the TPS first and see if it improves the shift pattern. My 4.8 has only done this once after been sat for 3 months. I plugged in the OBD cleared the code and did throttle relearn. You can check low brake solenoid by unplugging speed sensor on the 4.8.

If you can find any obd II reader you be able to check the auto box or clear fault code. To make sure its shifting correctly go into D and the manual mode a pick gear 3. It should change up and down and once in 3rd it should hold gear even into red limiter and should pop rev limiter. I love it going down town popping the limiter all the way down course way.

Also check your timing and if going to use nissan obd II you need fresh new ATF J matic.

 

mate how exactly do you relearn the tps, will be plugging my nds program into my 4.8 this arve to see what the go is with my auto box,
if you can let me know would be great,
thanks