I have an 03 Astro which I am installing a 99 5.7 v8 in. The engine is in, and I had a blue / red 0411 PCM programmed to a 99 5.7 vortec from a pickup truck. The PCM will not supply spark. I installed the original 4.3 PCM and it fired up immediately... short 2 cylinders of course. I matched the wiring from an 02 express van PCM diagram which only needed a few modifications, like EGR and of course the 8 fuel injectors! Im going to meet someone who is parting out an actual 02 express van with a 5.7 liter engine to purchase the PCM and hopefully it will start right up! If anyone knows more about this, Id LOVE to hear! In fact, call me! 480 266-8877 Joe