Sure, it could be the coil, but work from the cheapest solution to the most expensive. You said you resealed the pump. Did you install a new pump kit? Any kinks in the fuel line, any tie-wraps restricting the fuel flow or a clogged fuel filter? Air filter clean? Any restrictions in the fuel tank, either pulling gas out of or a venting problem. Any cracks in the pump line? Have you tiried swapping batteries with some one? That would be the #1 item to replace. Have you checked on you ground?
Not saying it wouldn’t be the coil and you if you have the opportunity to swap it out, go for it. But have a backup list of items to check if the coil doesn’t fix the problem. good luck
LAD Specialties customer / tony kart / rotax / kt100