i have the same machine i use the same brand that came with the machine i will send the name tomorrow the thread it varies if the machine acts up it's either the thread (rare) the bobbin the bobbin sometimes has to adjusted according to the flow of the thread check the book for that you really don't want to mess with the tension it does not help to change it just makes it worse did you get a walking foot?? i have an extra if you need it.
mema