Ok, so my problem started a couple days ago. When I went to fire my truck up it started a little rough (it does this on a regular basis if it hasn't been run for like 5 or 6 hours). But then it just completely shut off. I tried to fire it up again and again for about 5 minutes and then I finally got it start. When it finally started it blew a ton of white smoke. This is a 1995 12 valve cummins. Has anybody had a similar problem? This has been going on for almost 3 days now. Any ideas would help. Thanks.