http://www.eec-tuner.com
Can't say enough about it. You can program your own timing curves, fuel maps, maf graph, cranking pulse width, idle speed, etc.. I've had one a little over a year and I'm still learning, so don't expect to just dive in. I just finished wiring my mark VIII fan so the eec-tuner controls when it cuts on and off, pretty neat.\
Here's a link to the EEC-Tuner user manual...so to speak..
http://www.eec-tuner.com/biz_html/EE...ng%20notes.rtf