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I'm at the same place accept my problem is the yellow wire

I have 79 750F cyl's 2+3 won't light a timing lite, but when I ground the plug on head I get a weak spark, cyl's 1+4 are just fine. I've changed coil, switched the spark units, pulse gen tests fine, 514 ohms on yellow wires and 516 on blue wires. I even got a different pulse gen and put it in...