OMC 2.5L 4 Cyl 1982 120HP I/O with a 400 series outdrive. My boat was running fine over the 4th of July holiday weekend. I took it out the following week and after running wide open on and off for about 1 hour the engine started to die. Symptoms are as follows: Engine starts fine and idles fine. Will run full WOT then drop about 500 - 1000 RPMs. After about 30 seconds of dropping RPMS the engine drops to idle. It will sit at idle with no problem. *** I noticed on smooth water that the problem did not occur. If I turned hard or hit a wake it started to act up again. The 19 gal fuel tank was at least half full. Two years ago the points / plugs and coil were replaced for a similar problem. Any ideas? Coil bad again? Fuel problem - maybe the pick up tube in the tank?