Bad miss

[sm6989]

Alright..I got a g20 with a sr20det swap, My car is currently haveing a bad miss when you try to get on it, if you just stay normal and give it light gas, its not that bad, but when you go to give it more it barely goes anywhere thats how bad it is...My ecu is pulling two codes, one is the Maf sensor and the other one is the knock sensor..I've replaced both but still same problem. Only way I can get the problem to clear up for a bit is if I unplug the plug from the maf sensor while the car is running then plug it back in...then it'll run nice for awhile then just go right back to what it was doing...Can anyone help me out and tell me what the prob could be? Its just a stock 91 g20 maf, could it be too small since im boosted?