So I finally got my JDM D15B in my Si and it idles ok until it gets warm, then the idle jumps around. It smokes as well. I think its getting too much fuel. I am running the p28 and not the p08 since I have the 4 wire o2. I have searched for 3 days now and most people say the p28 should be fine. Some say I need the p08 base maps. Should I just use the p08? Can I use the p08 with the 4 wire o2? I have a Skunk2 intake manifold, short ram intake,DC sports header, AEM fuel rail and pressure regulator. I have no CEL and it drives good other than smoking like a diesel. I was told an AFC may help. I ordered the APEXI Neo and also the plug and play harness from Boomslang. Anyone have some good advice?