I have a 4-1200 with the 582 that was built in 1997. Recently right after takeoff, around 200 feet the engine lost about half of it's power but I was able to make it back to the airport. I checked all the normal things (fuel, ignition, etc.) and found all in order. I started it up again and did a lengthy run-up, and all seemed in order, so I took off and at about 200 feet the same thing happened. so I returned to the airport. Since I didn't want a "third strike", I started really tearing into everything and found the fuel lines from the wing tanks to the header tanks had deteriated inside reducing the 5/16th opening to about 1/8th. There was enough fuel to start the engine and taxi and run-up, but not enough to sustain full power for more than about a minute. The original lines were mil spec dated 1996. So, CHECK YOUR FUEL LINES AT REGULAR INTERVALS.