first all would like to say thanks to people and sites like this. i have a 2003 xterra i replaced the tps and set it everything when smoothly. i also replaced the bearing inside the distributor that also when smoothly. truck is running better now then when i got it 5 years ago. now the thing is shifting. truck shifts from 1st to 2nd great then once it gets to around 3000 rmps the truck seems to shift into neutral and the rpms run up. then i let off the pedal and it will catch back into 2nd but will not shift up into 3rd. got a pedal position code? i have done the reset 100 times but still the same. any help would be greatly appreciated. thanks for your time.