When I accelerate my 92 Chevy Lumina (3.1L V6) to about 35-45 MPH, and let go of the accelerator pedal, the car starts to stutter and shake back and forth for about 3 seconds, then it continues to coast down the road, does anyone know why this happens? :flash:

Have you checked the feul pump or filter.
Also it could be the Tie rods.:)

what gear is it in? sounds like the torque converter lockup

Yup, sounds like TCC shudder.

I agree Comp and Jeff, classic TCC sticking symptoms.