To burn chips, the Moates.net Burn2 is an affordable option:http://www.moates.net/burn2-chip-pro....html?cPath=64
The link posted for the GP1 package is a good value. I prefer the low profile chip socket, http://www.moates.net/s4-aries-28pin....html?cPath=26 which provides clearance to install the chip cover back onto the computer.
To burn your own custom chips, you can download the free PROM Chip editing software from TunerPro here: http://tunerpro.net/downloadApp.htm
The 1994 TBI V6 / V8 with 4L60E definition file and PROM Chip (.bin) files for TunerPro are located here:http://www.gearhead-efi.com/Fuel-Inj...Information-0D
With some minor changes to a 1994 5.7 liter TBI PROM chip, the 1991 350 TBI engine will work great in the Astro!
dave w
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