Hey guy's, my buddies got a 94 Cobra with some mods. S-trim,30 lb inj,MSD 6al,BTM,255lph pump,all the exhaust is BBK,75mm mass air, 70mm throttle body,etc..The car was running fine until a week ago. It starts up fine,then after about 10 seconds the idle drops, it backfires, sputters.It feels...