Where can I purchase a used Sewing Machine Foot Control Pedal & Cord

SOURCE: foot pedal assembly for White sewing machine

You only need to replace the cord if it has been damaged. It will cost less if you just take the machine , cord and control to a local technician and have him just replace the foot control. Let him test it first. A generic foot control should cost less than $30.
sewman7

SOURCE: lost manual, power cord, presser foot lever for Kenmore sewing m.

I think #39 on this link is the presser foot lever.
http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=3851249180&productCategoryId=1220000&brandId=0582&modelName=SEWING-MACHINE-HEAD&diagramPageId=00004&componentDescription=PRESSER%20BAR%20ASSEMBLY&documentId=00032216&backToLink=Return%20to%20Sub%20Components%20list

#13 on this link is the instruction manual.
http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=3851249180&productCategoryId=1220000&brandId=0582&modelName=SEWING-MACHINE-HEAD&diagramPageId=00009&componentDescription=ATTACHMENT%20PARTS&documentId=00032216&backToLink=Return%20to%20Sub%20Components%20list

If you're looking for the foot control, that is #16 on the first link.

SOURCE: Machine slows down,stops, starts again. Foot control problem?

Yes it does sound like a faulty foot control. The power cord is probably fine, you just need the controller. Ebay is a good source for parts.

SOURCE: I have an old Kenmore sewing machine and after

The motor is probably a YDK, what you need to do is take a drawing of the plug on the machine and go to your sewing machine shop and you will probably get one.

Testimonial: "thanks"

SOURCE: I have a Bernina Bernette h70 sewing machine I purchased at a discount due to there being no power cord or foot control. Sadly, I can't seem to find one online to order. Not even on the Bernina we

try
ebay
sewingpartsonline.com
sew4less.com
or try these sites --you may have to email them about the part
sewvacdoctor.com
a1sewingmachines.com