Hey guys I'm having a problem with my car running lean, I bought the car a few months back so I'm just beginning to dig into the problems but anyway its a h23 head/f22 block and h23 everything else. I changed the sparks today to iridium and my old sparks were way too white for it to be running proper fuel ratio. So basically I have no clue what the problem can be or where to start. Any suggestions would be recommended or even if there is an adjustment screw I don't know. The engine was completely rebuilt by the previous owner he may not of adjusted enough or is it entirely computer controlled? Car actually seems to be running great I just got scared when I saw almost white sparks coming out of the car.