9/3/2014 2:14a

I have a 6.0 powerstroke and when the engine is warm and hasn`t run for 15 to 30 min. and I start it again the engine starts to cough and produce white smoke.
But this does not happen if its cold or if i start it within 5 min. It also does like this sometimes when i barely touches to gas pedal. The head gaskets are brand new and i have also mounted EGR delete kit. Anyone who know what the problem might be?