Was driving today and noticed a noise every time you let of the throttle and continues until you accelerate again when it sounds normal. The sound is quite loud and sounds almost like a bearing gone or something but I don't know. Also happened around time I was sat at a red light and noticed quite a bit of smoke out the back but cleared quickly and didn't happen again, don't know if these are connected or not but both have never happens before, really scratching my head a need help 

thanks 

Noticed I've got a big oil leak on the right had side of the engine by the MAF I'll clean it up and get some pics to put up   The car has also has developed a slight judder under slow acceleration in 1st and 2nd gear 

Seems to be coming from around here can pinpoint exactly where