Hey guys the 7 got me pulling my hair out. The car starts fine and idles for about 10-15 seconds the stumbles and shuts off. The car has a walbro 255. greddy intake and racing beat exhaust. There is no check engine light car has perfect vacuume at 19 on the boost gauge while it idles. I have checked all hoses and the are all new silicone ones. Before this the car will start but stay in idle. But will misfire and the engine will stumble to stay on at the slightest touch of the accelerator. Can this be a fuel problem? Or a vacuume issue? I there anybody in the Miami area that can assist me with this issue? The closest mechanic to the car was ocean mazda and they told me that they dont even want to work on any rx7s. I am going crazy any help will be great.