shift problem

[sheriffandy013]

i have a 2000 psd with an auto w/ 125000 miles. no mods except for straight pipe exhaust and no cat. recently took edge juice off. When unded full acceleration (pedal to the floor) the truck pulls good right up untill 400 to 500 rpm before red line.it then looses all boost...im guessing the waste gate opens and dumps pressure. then the truck continues to gain rpms under normal aspiration. I have to let off of the pedal to allow it to shift. once it shifts it will again build boost and pull good untilll the next gear. Anyone run into this or have any ideas where to start? it does it in every gear


Thanks Andy