92 xj smokes....sometimes
 

Ok so I bought my buget xj from my work for 1600 bucks. About a week or so ago I I noticed that when I acclerate after sitting at a light,drive through or just random times it will pour out smoke. It looks blueish or whiteish in the rear view mirror.it doesn't do it any other time other than then. I've serviced it and have been running fuel system cleaner because the it sat for almost a year. Any ideas?