starting problems are always improper barrel valve setting, too lean most of the time. pulling the fuel shut off valve and running it out of fuel, too much cranking to get it back up to pressure, or just some type of problem with the fuel system itself. down nozzles are way better for tuning each cylinder when you have egts. I tend to set the barrel valve around 30% and keep leaning it out until a have a dead spot or hesitation, then I go back 2-3 flats depending on engine idle temp. when the engine will idle all day @ 160, you have got it right and most likely will start great 1200-1300 hp should be feasible