I am interested in buying FeatherLite Gas Blower, Weedeater. Model FL1500LE.
However I have a Cardiac Pacemaker and some small motors both Gas and
Electric effect them. Will this one be safe?

OK, what I might try is wearing ESD clothing. Something like these: ESD Clothes

What you are probably seeing is the effect of the length of the spark plug wire vs the frequencies the pacemaker sees. Electromagnetic interference happens when there is a discharge through that wire.

See:

http://www.magnecor.com/magnecor1/truth.htm

And

http://www.magnecor.com/magnecor1/main.htm

What I would do, since they specify that they can customize an order, is to call them and see if they would be willing to modify a lawnmower coil or weedeater coil and add the special cables.
You could possibly order a replacement part, have it modified and then installed by your lawn mower shop.