I have a 2006 Chevy Trailblazer LS 4WD.
When I take it on long trips. I get this problem.
When I stop at a light or sign then try to accelerate. It acts like there is no power. It lulls and barely accelerates. Until I reach 23 mph and then it accelerates just fine. Once this starts it does it everytime i stop and start again. When i park it at night and go in yhe morning. It's back to normal usually but not always.

 

Sounds like transmission issue.

I'd take it to where you can have a code reader check for faults. Only a few fault codes trigger the Check Engine Light. I go to the local Autozone for this.

 

it's a completely re built transmission. I've taken it in to them twice. They have found zero issues.

 

You might then take it to a second or even third shop to get a second and third opinion. The first shop might have missed something by accident or worse know they messed up and won't fix it for you.

 

You might then take it to a second or even third shop to get a second and third opinion. The first shop might have missed something by accident or worse know they messed up and won't fix it for you.