Mine has been having similar issues. It'll lock up and restart itself after several minutes or it'll be working fine and randomly restart itself. 1993 Geo Metro, tapped to the injector wire by the injector and into the VSS signal at the ECU. Oddly enough, sometimes the vehicle speed will go crazy and will jump around going from 50 to 89mph when I'm going 55. I'm not sure if its radio frequency interference from houses or what, but that is probably a separate issue. However, I just put a fairly good size aluminum heatsink on the back of the power regulator today so that should keep it much cooler, I'm hoping that solves the restarting problem. I'll let you know what happens.
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