Recently, I've had an interesting thing start to happen. After I've been driving for oh, say 1 or 2 minutes, the glow plugs will start to flicker on an off. Sometimes they will go through a full cycle, just like when I first start the truck, sometimes they just flicker, and once or twice they've stayed on long enough to make me worry about melting them (30 seconds or so) so I have to pull over, turn off the truck, and then start it back up. Anyone had this happen before? /forums/images/graemlins/confused.gif Any ideas what it could be? /forums/images/graemlins/dunno.gif I've checked all the connections to the glow plug relay, and everything seems good.