No. Your jailbreak will remain as it is. Syncing your iPod does not alter the jailbreak in any way.
Yes and no. If you sync it your iPod will remain jailbroken. If you update it to say 4.1 it will un-jailbreak your iPod. Then you will need to re-jailbreak it.
Steps1 Do a back-up from your iPod. Before you jailbreak your iPod, be sure to sync with iTunes to back your iPod up. This is just in case anything goes wrong.
sync it using itunes that should do the trick
Yes, first sync your ipod though. Don't update to 4.3.4 or 4.3.5 yet as those have no untethered jailbreak.
The bad news is: It won't be on your iPod after you jailbreak it and you're gonna have to re-sync it (boring!!!). The good news is: It will still be in iTunes.
If they are apps downloaded from cydia, then no, because cydia apps don't sync with iTunes.
Plug it into your computer. Open iTunes. Open the iPod tab. Sync it. Click restore. WARNING: THIS WILL ERASE ALL DATA FROM THE IPOD. Use the backup created when you synced earlier to restore the data. This will not put the jailbreak back on.
Yes, but downloaded apps from Installous will not sync with iTunes.
How to jailbreak my iPod touch
to jailbreak your iPod 4.1 go to greenpois0n.com
to jailbreak your ipod 4.1 go to greenpois0n.com
No but you can jailbreak an iphone or ipod touch but they each have different sites to jailbreak your ipod/iphone