Hi there,
you really should start by checking your breathing. Make sure you are taking in enough breath with the lower part of your lungs.
Next check your body is relaxed.
Every stutter/stammer is attached to a human being so it isn't a one cure fits all.
It is usually a mixture of how you are using your body and how you are thinking and feeling inside.
The only thing I can really tell you without seeing you or giving you my e-course (go to my website) is that in many cases it is a breathing problem and it would be a good place to start as it may fix the problem in one go.
You can try sing-speaking. Sing up to 10 quite loud then change to speaking then back to singing. Notice what you are doing differently with your breathing and mouth. Now change back and forward from sing to speak to sing and use the same breathing, mouth and volume and find out it that takes it away.
good luck
Laura Spicer
http://www.spicer-ameldian.com