Car wont idle since turbo install

[Jookmasta]

well i recently installed the turbo and we got it to start up perfectly on the first try. We then fixed some oil leaks and took it for a tune session on the road. We tuned for low throttle and everything went smoothly. We then tuned for high throttle and blew off the IACV hose off the cold pipe. So we barely made it back home and then we developed an exhaust leak betweent the mani and block. So we hooked up back the IACV hose and now the car wont idle for nothing. If i let go of the gas, it will idle nicely for about five seconds and then the idle will become erratic and then it will die. What is causing this? We think the MAF may have went bad but who knows? I can drive the car on the road tho but its running pig rich at the moment. Under load, there is hesistation and when i come to a stop, i have to keep the revs at around 2K or else it will idle for like a couple of seconds and then die. Please help as this is my DD