greetings, just as the title says, after the truck has been driven and she's warmed up to "operating temp", and I shut 'er down for say 30 minutes or so, and then try to fire 'er back up, she don't wanna turn over. takes several cycles, and by that I mean letting the glow plugs cycle and then cranking her over repeatedly, like 4 or 5 times and then she fires up. I don't like it, not only is it embarassing, but a potential safety issue. If anyone could clue me in on why this could be I would appreciate it, thanks.