YOU MAY HAVE EXCESS AIR ENTERING THE INTAKE SOMEWHERE!!! Connect your AFM, have a friend start the car, you manipulate the AFM by hand it should run but you will have lean back fires. The same thing happened to me at first I was thinking that when I replaced my intake/exhaust gasket that I screwed it up. After trying the procedure I listed above, low and behold I missed a huge vacuum port that was hiding between the 5th and 6th runner. Also You can take the time to spray carb cleaner around your intake manifold and listen for changes in your idle...Ryan