Little late on this one, but BTDTNA. It most likely ain't the coil, cause I spent the money for a new one. It most likely ain't the fuel pump or the carb. What those exact symptoms were on my 2135 was trash in the tank.
That huge filler and years on less than perfect fuel containers and transfer inevitably gathers in some bugs, small leaves, general detritus. It settles to the bottom and restricts fuel flow to the carb. Run hard for long enough and restriction exceeds demand and starvation occurs.
Pull the fenders, drain and clean the tank and it's good to go again.
jack vines
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