2004 Nissan Sunny now my car wornt idle

First it shuts down, and the engine light came on. After getting it started bad performance iddle heavy bucks before every gear changes automatically, sotts and heavy gas smell from muffler. Carried by two machanics for diagnostic which they both said maf sensor need changing, change it brand new one and same problem another machanic told me to clean injectors did that and worst now right after starting the car and the engine light comes on the car cuts off, it just not iddleing please help me. Nissan b15 think is e trottle