puffing

My exhaust used to be continuous and smooth while idling. Now its not continuous like there are gaps between the air coming out. No smoke except white smoke on cold days in the morning that goes away after driving a bit and I've been told that it's due to condensation. What's up with my car btw...

I have experienced a puffing noise when the power steering is at near full left lock. Quite loud when the windows are open. Is this usual? Car has the red fluid and the steering doesn't make any other noticable noise. Is this a sign that the rack/pump/resoviour may have a problem....

I have a puffing sound from the back of my 2l 145. It might also sound like a suction sound but a bit more acurate and stronger, The car is also idleng irraticly. Power is also down, What couls this be? Please help.