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Comment number of shareware / freeware options (Score 1) 270

I'm not so sure about open source options but I've done this before using customized configurations for my '96 Chevy Impala. The PCM was from a '94 and was an ODB1 unit (more programable than the ODBII based PCM), hooking up a laptop with a custom built ODBII to Serial cable I was able to use various shareware / freeware to flash and monitor the PCM. It has been a while so I'm not sure what software was the best. There are a number of people (i.e. http://www.pcmforless.com/ (who I used)) that offer tuning services online because they know what the correct settings are for various vehicle configurations. It is not a good idea for a novice to just jump in and start changing fuel mixture ratios or shift points on the transmission ;)

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