Brian Coles

Could my interface or relay be overheating? When I take a long drive or idle for a prolonged in the heat(99 in the shade), the car misses and then dies. No check engine light. Car at normal temp. Voltage normal on gauge. Has happened 3 times now,only since I installed the nitrous. It will restart and idel but if I give it gas it misses,sputters and dies. If I give it time to cool down it acts normal. I have tried turning A/C on and off but no change. I have tried to arm nitrous no change. Any sugestions are appreciated!