mrasmm

you might also check if there is any short in the wires or something. You could have an intermittent continuity problem, like cracked solder, hot and melted solder, not a big enough surface area to put the amount of current through that you are looking at. too small of gauge or wire, or something like an intermittent short within the insuation of the wire, just a couple of ideas of things to check out =)

You might also check the radio signal, like have someone walk away with the Tx while you are holding the plane and see if it could be a range or interference problem. I guess none of the other servo's go crazy or anything, just the throttle.

Are your batteries getting hot? Do you have a watt meter to tell how far the voltage is going down under a load?