Alright so, I own a 1990 Fairlady Z. I haven't had any problems with it until a few weeks ago when I noticed it felt like it was surging power. Then one day it decided to just die in the middle of an intersection. Ten minutes later it stared again and i pulled it off the road. I talked to a mechanic and he said it was my ignition control module. So I replaced that, but it is still surging. And also at about 4300 rpm I can hear the exhaust make a sputtering sound. I'm thinking its my MAF but I don't know for sure. Anyone have any ideas?