Last year I purchased a 2000 Regal 2100 LSR with a 4.3L that had a spun main bearing. I purchased a long block and while I was at it I figured I would throw on a Edelbrock Intake and 4bbl. I replaced all the plugs, wires, cap, rotor, ign coil, hoses, belts, fuel filter etc. Basically anything I thought might give me a problem. Boat ran flawlessly all summer. Last Sept I had it out and it ran fine all day. As I was heading back to the launch and the boat just quit at about half throttle. I thought I ran out of gas since I had never run the boat down below half a tank, I figured the fuel gauge wasn't working. Waited a couple of minutes and fired it back up, it ran great for about 30 seconds and died. I made it back to the launch, pulled it out of the water, went to the gas station, threw 30 bucks in it and went back to the lake to make sure I didn't have a problem. Fired it up, ran it out on to the lake, ran perfect for 2-3 min and quit. Made it back to the launch with the boat running fine and quitting for about 30 seconds at a time. Figured I must have gotten water in the fuel. A few days later I changed the filter, brought a spare with me and headed back to the lake. Fired up the boat and it ran perfectly. Ran the boat for what had to be about 6-7 miles (around the lake) and just as I am thinking ok she is all set, it quits. WTF...I change the fuel filter while I am out on the water thinking there is water in the gas and it clogged the filter. Change the filter, boat fires right up, I hit the throttle, its running perfect, no bog etc...I make it about 100-200 yds and it dies again. Make it back to the launch with it running for about 30 seconds at a rip and take it home. Fire it up in the drive way. It runs fine for at least half an hour on the ears. (ok this is driving me crazy) Finally it quits...I immediately pull the fuel line and see if the fuel pump is pumping. It fills a two liter bottle very fast. More than fast enough to keep the carb full. Ok its not the fuel pump. I have the fuel tested by a buddy of mine. Fuel tests fine. No water etc. This is as far as I have gotten and I am not sure where to go from here. I had to winterize the boat and put it in storage. I am getting it out this week and want to get this straightened out.....I have been thinking about it all winter and still don't really know where to start. Could the ECU be getting hot? Please give me some ideas