weatherman

How does one go about changing the coil? Tx

Thanks Bill ... thanks guys for the suggestions. I really appreciate your thoughts. wxmn

I have a 15 hp Evinrude, cira 1985, which started, when running down the lake at high speed (approx 10-15 minutes time), of loosing all power - continuing to run, but only at 1/2 speed. The motor then surges - ie a couple of minutes of no power then a 1/2 minute of high speed power.... I have had the carb cleaned and disposed of all fuels, drained hoses, etc and have started using a fuel additive (Sea Foam), but to no avail. I'm open to suggestions on what to look for in correcting this problem. It has been in a repair shop, but they keep saying it is an ethanol problem. Is there a hose or something between the carb and the cylinder that could be partially blocked? I'm open to suggestions .. comments appreciated. Thank you.