Engine Performance problem
1998 Mercedes Benz 300e 6 cyl Two Wheel Drive Automatic 99500 miles

I own a 1998 Mercedes Benz E300 Turbo Diesel. For some time it has been difficult to start. If I do not have the time to warm it up for more than 10 minutes or more in some occasions , it chokes, loses power almost totally, and lots of white smoke comes out the exhaust.

I keep the car in the garage, it is not heated, but never happened before.

Thank you!