Does any one know where a performance shop that has a dyno could be found in Tyler/Longview area? Thank you

There is one in emory I am not sure how much that helps tho.

There's one in Atlanta TX too. It's about an hour from Longview. Take 259N to 155. Turn RIGHT on 155 to Linden. In Linden take HWY 59N, it will be about 10 miles up on the LEFT. Addington High Performance.

If you want ... I'll tune you're truck there. We'll have to seup a time to meet though.

the closest that I know of is in Palestine. Here is their contact info.
http://www.oldwestracing.com/images/banners/montee.jpg