DONT assume....just cause you installed stuff doenst mean it IS or ISNT related. ALAWAYS diagnose as if its a new problem....only keeping in mind newly done work...this always saves you from problems and ending up down the wrong road....
The first thing i would do though....since its free...is make sure you have ALL the stuff cleaned off the contacts in the PCM where the chip pluggs in. If you do...i would pull the right hand valve cover and make sure the UVC harness is ok. Ohming it can be deceptive because they can make good enough contact to ohm good...but not good enough contact to carry amperage.....so a visual on it is usually improtant. If it is keeping good contact....try to find someone with a scan tool to both buzz test and do a cylender contribution on that injector. Since its not missing....."killing it" wont do anything for you. let us know the results of this stuff....