Lately my truck has been taking longer to start then it normally does. Its fine when its cold and I let the grids heat up, But if I drive it to the store or somewhere shut it down come back out few mins later and start it (not waiting for light) it sputters and dies. Have never had this issue before. Any Suggestions. Just fueled up so bad diesel is out of the question. FASS pump running, can hear it. Any ideas would be great. It doesnt always have this issue, now comes and goes. All The filters were changed out bout 4k mi ago