Car Wobbles on 2002 Nissan Pathfinder

Everytime I release the gas pedal, then hit it again the truck begins to wobble....why? My tires have been rotated, and balanced, shocks have been replaced....idk?

2 answers
Check the front end components for wear particularly the tie rods ends. Have a partner that won't run you over move the steering wheel back and forth in short quick movements while watching the steering components.
Could it be a shudder from engine or transmission performance? I would recommend those areas be inspected.