white smoke on start up after it gets up to temp .definitely not all the time comes and go/s usually in stop and go stop and go traffic. I believe its fuel. oil level is fine truck still runs great any ideas .will a buzz test confirm these symptoms I need to take a long trip hear soon should I stop driving it and how to find out witch 1 it is PLEASE AND THANKS FOR ANY AND ALL INFO 2002 7.3 250/000 miles along list of mods 38r coreys tc php tunes someone suggest filling fuel bowl with sea foam or 2 cycle any body have ideas really needed .looking at pis 238ccor 239 cant remember