Abagheshian

It's a 1.6 ecotech petrol engine I believe it is a 16 valve

Hi I have recently been having a problem with my zafira life 04 reg I have lost all power when accelerating, the max speed I get is about 45mph. The engine sounds like it is clicking when I accelerate but it does still sound like its producing power When I rev it when parked there is a rattling in the lower drivers side of the engine Although I believe I saw white smoke a few days back all I seem to get now is a strong smell of petrol when I rev Any ideas would be greatly appreciated Thanks