owning a 90 nissan maxima that i am slowly turning into an autocross car, its rather difficult finding aftermarket performance parts. that being said, my maxima started running rough a few months ago so i started tring to diagnose the problem, eventually i back-probed the injectors and found that they were not being pulled completely to ground. this led me to believe that the injector drivers in the ECCS were faulty, im wanting to not only repair this problem but Im also wanting to fix it better for the long run, I have found a site that seels performance chips but i do not see and place that is willing to repair this problem, if it  is indeed the drivers, if i sent the ECCS in for the chip would they fix the drivers? would they charge extra? would they just install the chip and send it back with the problem? if im paying $675 for this chip i would like to know if they would take care of this problem as well.  

mmm. I think your best bet is to contact them and ask them these questions.