transmisson shuders

i have a 1999 pontiac bonny with 58,000 miles had transmisson fluid changed now when i am at a complete stop and push throtle down to fast the transmisson shuders anyone out there have any ideals to what the problem is thanks.

Check the fluid level when the trans has warmed up. The same thing happened to me when I changed the fluid on my 97. Once it was topped up the shudder went away. Good Luck.