The bottom thread keeps bunching up and stalls the machine with the #E6. How can I fix?

not sure if this will help you...Check Your Tension Settings. Looping underneath the fabric usually occurs when there is not enough tension in the needle thread to pull the bobbin thread. Sometimesthread buching can be caused by something as simple as the tension dial being inadvertently turned.

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try a different needle
here's a link to a free manual from singer
http://www.singerco.com/uploads/download/1199_8770-efs.pdf
some machine can't handle thick fabric & some can
rethread the machine top & bobbin
clean under the needle plate & in the bobbin area
make sure the thread has not come off the thread take up lever

try changing the needle
check the top thread tension to make sure it's not to loose
rethread the machine top & bobbin, make sure the bobbin is wound
correctly & inserted correctly into the machine
make sure the thread has not come off the thread take up lever

then it's very possible that the machine is out of time & needs to be serviced
make sure the needle is in serted correctly--flat side to the back of the machine & all the way up into the needle holder

change the needle
rethread the top thread & make sure the top thread doesn't come off the thread take up lever
make sure the bobbin is not warped
make sure there is no lint in the feed dog area
some needles & thread are not compatable-try this

Cut 6-8 inch piece of thread of the spool you are going to use for your project
Take the needle you are going to use for the project
& insert the thread thru the eye of the needle
& lift one end of the thread to a 45 degree angle
& if the needle is the right size for the thread it will slide down the thread
But if the needle hangs on the thread you need one size larger needle for the thread

Make sure your UPPER thread is correctly threaded in the machine, put the UPPER thread tension dial to 5. you can also try it on 6, 7, etc., the higher the upper tension is set the less top thread will show on the bottom of the cloth.

check bottom tension...but first make sure your threading machine correctly

either bottom first or top tension....top tension should be set to 4-5 bottom should feel when pulling about the same tension

when you have bunching on the bottom, you have a problem with the top thread: no tension. (and visa versa) Make sure the thread runs through the tension discs, these discs are activated when you put the presser foot down, so you want to thread the machine with the foot up, also feel if there no burrs, hooks, or whatever, so your top thread comes smooth off the spool, no jerking.

the needle thread tension is wrong
bunching up under the material indicates that it is too loose

Try a different bobbin. Look for one that is a little narrower. I had the same problem and changing to a narrower bobbin fixed it.