I have a 1996 Astro van with a stock 2000 5.7 vortec/4L80E trans. The computer was reprogrammed for the V8/4L80E by mail and I did the necessary harness changes. It has been running for 20k miles. I am wondering what maps have actually been installed. Built a Megasquirt for a 4AGE with IR intake so not completely lost but close. What is needed to find out what I have and best/easy way to tune? Thanks, John