Hi, this is my first post on this board! When I start my truck on cold mornings it sometimes sounds like a car hitting a rev limiter, except at idle speed. Like a fast fluctuation of fuel-no fuel-fuel-no fuel. If I give it a little throttle it goes away, let off it will do it again unless I hold the throttle for a few seconds. I think it sounds kind of cool, but is this a sign of other problems to come? I have no diesel experiance yet. Oh yes, for anyone out there on the hunt for mpg...this thing got 23mpg stock on the last two tanks.