bmw 528e 86 problems with start!

I have a bmw 528e 1986 but am having trouble when i try to start the car,sometimes not all the times. I have noticed that during the hot season (summer) the car works a little better and during the cold weather or winter the car gets harder to turn on and it starts to throw out alot of smoke but then it gets normal. i have changed the fuel relay,cold start sensor but it stays the same. Is it possible that the airfluid meter cause the problem? i would apreciated if somebody helps me with this problem.

If any info please email to [email protected] thanks!