Has anyone worked with the Jet Dynamic Tuner. I recently purchased this to use on my 97 5.7 Vottec 1500 2wd. truck. And also to use on my tow vehicle 2000 7.4 2500 4wd. truck. I am getting very confused with this programmer, and havent found anyone who has a tune they have used on my trucks. The tech support is very bad, I called and they said they couldnt help me I would have to email an engineer. I did that a week ago, and havent heard a thing back. Any info anyone may have would be apprieciated. Its alot of money to spend and not be able to use.