I have a 150hp mariner magnum ser#A943153 that doesn't idle or start well.Top end was rebuilt by Merc dealer has good compression.Carb were disassembled and all passages blown thru,then rebuilt at a later date by a boat mech.The engine spits back some at a idle like its running lean.Stator was also replaced due to overheated wire.Runs good above an idle.any advice greatly appreciated.<br /> Thanks Chris