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1999 pontiac grand prix gtp supercharged vin 1

There is a short between the ECM Sense fuse and the PCM. I have done all the basics, visual inspection, meter, etc and cannot figure out how to locate the short. There is a wire that connects the bottom of the fuse to the PCM through the fuse block under the hood. If you disconnect the PCM the short goes away. Replaced the PCM but did not help. Any help is appreciated. Thanks.
 
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