boat wont get on plane

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?

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