$150 for carbon cleaner is way high. It is very simple to do assuming you have a flat blade screw driver and paper towels you can do it at home. buy
This remove your intake tube to expose the throttle blade
. Have your wife/buddy get in and turn the key to the on position (DO NOT START) and floor the gas pedal to hold the throttle blade open. Spray carb cleaner onto paper towel and wipe above and below open throttle blade. You should see it removing the black carbon stuff around the blade. Continue doing this until it is clean, then start it up and spray remaining carb cleaner directly into intake. Keep it alive it will try to die, reinstall the intake tube and you are good to go. Sounds like $150 bucks to me doesn't it.
What it may/should look like Before on top (Dirty) after on bottom (Clean)
Hope this helps ya