Nissa pular vibration problem

Hi there i have a 2001 Nissan pulsar n15.. i recently brought the car and have noticed that when i turn the car and step on the accelerator the engine vibrates the whole car . i have shown the mechanic the problem...he replaced some of the engine belts and some of the things that hold the engine in place. but still failed to find the cause of the problem....

Can you help me find a solution to my problem???? Thanks !!