D 15 dies

True it could be the coil but it also sounds like something is floating around inside the tank blocking fuel from coming out.  It may also be the condenser.   I'd check fuel flow first as it won't cost anything.  Remove the drain from the carb bowl and catch the fuel in a clean container.  Let it run for awhile and see if it stops before the tank gets empty.  You can also look inside the tank with a flashlight to see if anything is floating around.  

I agree !!

I'll double check the fuel system.  I cleaned the tank, put a new sediment bowl and fuel line one last year.  I'm pretty confident it's the electrical system.  The engine stops like you turn the key off.   There's no sputtering or backfire like fuel.  I'll rob a coil off another tractor and see if that works.

i tried doing the carb on my 15 cause it started dying under load plowing however like a putts i dropped my lower half of my carb right on the floats and bent them pretty bad read online that the floats should be 1/4 inch from nearist face of carb where gasket sits so streightend  it out and reinstalled did not now what to set the carb at so on my marvel sheber carb i set the big screw in front 3 turns out from all the way in and the little one on the side 1 turn out on start up motor is acting like it back fires through the air breather tube but cleans out once the engine warms up i still need to plain the manifold yet also but now that i have bought a original shop repair manual im going to try and take the floats out for a closer look it is funny i would not think it would burp through the air breather i submurged the floats in gas and did not see any bubbles so maybe im just bending them too much????? i should have held on to it tighter slipped right through my hads ran worse before i rebuilt the carb so i guess every time i take it apart it can only get better and better what is the standered setting some of you all set your 15's at?