I have a 97' 4.2L and my problem is when I start my truck in the mornings, white smoke appears out of my tailpipe. I have had this problem for about 4 months and thought it was something to do with my oil but I went and got that changed and it still happens. Recently, I'll start it up..white smoke will appear...then a "pop" will come as if my engine is backfiring? I really don't know much about cars and need all the help or advice I can get. Thanks