Product review (5 stars): You can repair your stove yourself!
Does one or more of your heating burner/elements not heat up unless you jiggle it just right?
If so, then you might want to consider replacing the receptacle, and maybe the burner too.

Pull out the burner and look at the ends where they go into the receptacle. If they aren't nice and smooth, then you probably want to replace the burner AND the receptacle. (Especially if the ends look rough and partly melted.)

It is super simple to replace the burner on an electric range. Just pull out the old one and plug the new one back in. These may not be exactly the same as the original ones, but they work fine.

What about the receptacle, is that easy too?

Yes, it's an easy job. The receptacle kits are $5-$10 here on Amazon.
Let's walk through how to replace a receptacle and get your stove working like new.

Pull out the stove.
++++ Unplug it from the wall. ++++
 Optional: Clean 20 years of crumbs and forgotten toys...)
Take off the burners and drip trays.
Lift up the range and you can see the old receptacles.
Note that the wires go toward the temperature knobs for each burner.
  (On your stove, this may be toward the back or toward the front.)
Use the screwdriver to remove any access panel(s) so you can follow the wires.
Put the screws in a bowl so you don't lose them.
Now you can see where the wires have push-connects near the temperature knobs.

Now that you've seen the whole project, you can start to replace the receptacles one at a time.
See how the old receptacles are held on by a screw on the bracket?
Unscrew the one you are going to replace.
Now use the same screw to put the new bracket on. (The receptacle kit comes with new brackets, so you might as well use them.)

Now look at the old receptacle hanging down.
++++ Double check to make sure you unplugged the stove, and that none of the curious children has plugged it back in... ++++
Use wire cutters (or even kitchen scissors) to cut the old wires away from the old receptacle.
Pull/fish those wires out toward the knobs, but leave them connected at the knobs for now.

Now look at the receptacle kit. The receptacle and the wires are probably separate when you get them, but the wires simply push into the back of the receptacle with a click. It might take a bit of force to push them in, but they will go in if they are aligned correctly.

Snap the new, wired receptacle into the new bracket that you've installed on the stove.
Put the new wires where the old ones went, following the same path.
You want any extra wire to be behind the panel, not under your stovetop.
Unplug the old wires and plug the new ones in where they were. (It doesn't matter which wire goes to which connector.)
  Optional: You can coil up the extra wire and use tape/rubber band/zip-tie to keep it neat.

  Tip: If this is the last receptacle replacement, you can spiral-wrap the wires around the rest of the wires to keep them neat. That way you won't be tempted to use zip ties or tape under your stove top.

Re-assemble the access panels, drip trays etc...  You'll probably have to spread the new bracket apart a bit to get the burner into the new receptacle, and use a bit more force than you are used to with the old set up. It's new and tight.

Now you can plug the stove back in, and slide it back into place.

Test it.
Does it work? Of course it does!
Congratulations! You just saved yourself $$$ you would have spent on an appliance repair man!