My car seems to be a little sick but I am not to sure what it is? On a cold start it judders. I have got out and looked and the exhaust is moving and white smoke is coming out. A rev normally fixes this. After about 30 seconds the juddering stops and no more white smoke and it drives fine. Now I have checked under the oil cap and there is no white sludge, water tank water is still pink and filled up, but I think it has lost some. I only filled it up today and it has not lost any power. Its not over heating either. So I am ruling the head gasket out for now. But I am stumped. I have a few idea on what it may be but please tell me if I am wrong. Fuse plugs? Bad fuel? MAF sensor Starter motor Battery Timing belt out (Had it changed a year ago) Head gasket (Although I dont think its this) Injectors Sticky valves Few videos http://s191.photobucket.com/user/Mastspotter/media/2013-07-24074850_zps96d2381f.mp4.html And a worse one taken about an hour ago. This had been running about 10 minutes. Its pouring down. Previously to this I had to use it for about 45 minutes about an hour previously. Temp gauge had gone up and down a bit. Never to full. But rested at half. Car again lost no power. Smoke suddenly stopped then. Anyone have a clue?