The most common cause of a misfire on the Z19DTH is the wiring to injector 3, although the symptoms you describe (apart from the misfire) don't really point to that as wiggling the injector plug usually causes it to correct itself for a while and it sounds like you have had them disassembled. Vauxhall do a kit to repair the injector wiring as the plug becomes corroded internally and needs replacing, so a common enough problem, might be worth another look?
Shaun
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