I have tried to sync my iPod to iTunes but it comes up with "The iPod (name) cannot be synced because there is not enough free space to hold all of the selected items (additional 3.83GB required)." I have no items selected??? How can I sync and add?

Check you sync settings. Maybe you are really syncing items:

Do you have the right boxes checked to sync?

iTunes: Syncing media content to iOS devices and iPod

Try syncing using the manual method

Managing content manually on iPhone, iPad, and iPod

Next try:

Connect the iPod to your computer and look at the storage used by the various categories as shown in the colored bargarph in iTunes.

Come back with the results.

An "other" larger than about 1 1/2 GB indicates corrupted files.

What is the Other on my iPhone and How to Remove It

What is "Other" and What Can I Do About It?

Next, usually restoring from backup eliminated the corrupted files. However, sometimes restoring to factory settings/new iPod is required.

To restore from backup see:

iOS: How to back up

To restore to factory settings/new iPod see:

iTunes: Restoring iOS software

If still problem restore from backup. See:

Restore your device from an iCloud or iTunes backup - Apple Support

Last, restore to factory settings/new iOS device.