I have been having an intermittent lean start on my 92 k2500 350 and I bought two new gp Sorensen injectors from vatozone today and it wouldn't even run.. Surged was so lean the O2 read .1 mv so I did process of elimination and eventually went back to my stock injectors, I even re spliced the wiring just to be sure. And the stock ones run fine and the new ones don't, am I missing something?