I changed the heater core today along with the thermostat. Everything went in okay, but after I got it all back together and went for a drive the truck decides it wants to cut out /forums/images/graemlins/confused.gif /forums/images/graemlins/confused.gif...Almost as if it is not getting fuel. I could not mess with it too much more as my son woke up /forums/images/graemlins/thumb.gif and my parents were wanting to leave???? Any ideas where to start looking tomorrow???