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Thanks for all the imput ya'll, it was the wiring going to #3 injector which was a hidden repair by the last owner. The electrical tape over his soldering job had slipped or worn thru and the two injector leads touched and caused the mis fire.
The only way I found it was to have the car running (just barely) and start yanking and pulling on all parts of the engine wire harness. When the idle changed pitch I just concentrated on that section till I isolated the section of wire involved.
Yea, stupid but true.
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