I've got a 00 gt ... Previous owner told me he used the car on road tracks and before he sold it he took out big injectors put factory ones back in. So when I recently had it running like crap it had a code for mis fire cylinder 5. So at that point I talked wife into spending a few bucks for bigger injectors msd coil packs and new plugs. Yes it has a performance intake and throttle body on it. Didn't run right when done. I reset computer .. No help. New cam position sensor no help. 3 new injector connectors it started idle good for about 3 mins then went back to surging and when trying to move it it has a severe miss and you can smell fuel in exhaust... I've got no vacuum leaks everything is hooked up... Where do I go next??