soldering ignition coil harness wires?

dont see any info on here about doing this. anyone tried this, comments, info, any experience good or bad with this will be nice.

i recently had issues with the ignition coil wire harness and had to solder all four of the neg side on each of the connectors. seems like ive lost a little power, so im just gonna replace the entire harness. wonder why this has happened, i used solder and shrink tubing...thought it should work.
 
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