problem

Hey guys i need help bad!!!!!! My cobra has a blower on it, with 42lb injectors and aftermarket fuel pumps, yet stock ignition. Im putting an msd on it tonight. The reason i bring this up is bc it might have something to do with it. OK the car can be gunned in first and second...no problem...if you gun it to 4th or 5th , sometimes the check engine light will come on and the car will want to die...if i put her back in gear and keep it going, the light comes off and the car runs great....it always runs great.... WHAT DO YOU GUYS THINK IS CAUSING THIS??? STOCK IGNITION >? not getting enough spark??? HELP PLEASEEEEE