Shuttering transmission / engine problems

[Juanto]

My transmission sensor was throwing a code and I had it replaced, I get the car back and everything is good until I notice it shuttering upon acceleration from a dead stop. For instance, I was at a stop sign and I start to go, it's almost like the transmission goes neutral for a second and then lurches forward, it's really bad because it's un-predicable and when it surges its like i pressed the pedal to the floor.

Does anyone know what could be the cause of this?

P.S - I'm a camera guy so please do forgive me over the 'shutter' shudder' misspelling