Toyota Tondra 03

I have a Toyota Tundra that shudders under acceleration. Its an A/T two wheel drive. Engine rpm remains constant, vehicle shudders.

Much more info needs to be known before even a half guess can be made.

Mileage on the truck?
Check Engine Light on?
Idle smooth?
Had it scanned for codes at some point?
Any recent service work before this problem occurred?

111,000 miles
No check engine light
idle smooth
not scanned
no recent service

it just started happening yesterday