I just performed a sr20det swap into my 90' 240 sx. I went o start the car but it idle's like crap and is running really rich. I have spark in alll cyclinders but every time I pull my plugs they're black and smell like fuel. I checked all my wiring and everything is hooked up right. I've checked for leaks and can't find any. Any suggestions on what the problem could be. All my fuel lines are hooked up right too. The car will idle really rough but if you give it gas it stalls out.