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the is the cylinders which are not up to snuff, 2 and 4.
if it's trigger points, it would be 1 & 4 or 2 &3.
if it were grounds, it would be 1 & 2 or 3 & 4
that says to me your problem is at the cylinder level, either bad injector patterns as Dave suggested, or leaking valves. I assume that the spark is good since no spark would cause the change at all when you disconnect the injector plug.
check the compression first, then test your injectors if the compression is good.
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72 914 2056: 74 9146 2.2: 76 914 2.0
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