Case 660 Ignition Coil

My 660 Combine has started to act up and it wants to bog down and die while driving, but stationary with the machine engaged it runs fine. Points in the distributor look clean. I am thinking it is the coil, so i purchased a new coil with internal resistor and she wont run much at all. Would anyone know if i just need a non resistor coil?
 
when it starts to "bog down" does chocking it change it or not? might be a bit lean of so or something in the carb, I have seen coils many times cause running issues,, most times I see them start and run ok cold but when it warms up you get misses,, when replacing the points replace the resistor too,, the machine would have had a resistor block before the coil when new,, so if it is still there use one without a resistor
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