boat wont get on plane/ mercury 150 efi

have had problems with my boat for a while. Have tested and sent to a shop and total tests include: trigger, stator, powerpacks, switch boxes, throttle position sensor and nothing. the boat will run fine and then all the sudden bog down like its in a protection mode and wont let me get on plane. sometimes it kicks out and runs fine for the rest of the day and other times i have to idle back to the ramp after the mechanics lake test it without it acting up what so ever. have replaced fuel lines and spark plug recently. any suggestion? the engine is a mercury 150 efi

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