Ok, so here is the deal. I have twin fuel pumps runnin on E85. After drivin for 10-20 min my car will start to lean out. I thought it was just a my primary fuel pump going out, so I just swapped them inside the tank and it still leaned out after drivin. Next i checked in inline fuel filter and it was good. No dirt or anything came out of the filter. I don't really think it could be an injector problem..... So what else could it be? I'm pulling the CEL's tomorrow. I usually have 2-3 on the car that always come back but never effect driveability.. All mods are in sig... I don't think its a boost leak bc it doesn't do it constantly or at all until its been driven for a while.