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Here is the cure...

Yes, I have done the same thing many times; but the problem returns in a few days or weeks. The soldered connections on the P.C. board in the ECU are 20 years old. Unpluging and re-pluging them wiggles it and it makes a good connection again, for a while... The real fix is to re-solder those connections. Pull the cover off the ECU and solder the connectors. This can be done without removing the boards inside. I fought this problem for three years before I found it. Good luck.
 
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