2005 Magnum R/T 5.7, did MDS delete, heads reworked and small cam (comp cams stage 1). 3200 FTI torque converter, 6.4 injectors, shorty headers and 3" dia. exhaust. Car starts and idles for a couple minutes. Restarts, idles for 2 or 3 minutes and dies again. I'm thinking throttle body issue but can't pin it down. Throttle body is new as is EGR valve. PCV disconnected, will not idle with pcv connected. Any help greatly appreciated.