What's your problem? FIX ERROR 306 - Apple iTunes

From http://support.apple.com/kb/TS3297

iTunes Store loads partially or returns "Error 306" or "Error 10054"
Proxies, parental control settings and software, security or filtering software, or a bad iTunes Store cache can cause this.
To address proxies, Remove Internet Options proxy settings and connect to the Internet without a proxy.
To reset iTunes Store cache:

1. In iTunes, choose iTunes > Preferences (Mac) or Edit > Preferences (PC).
2. Click the Advanced tab.
3. Click the "Reset cache" button.
4. Click OK and see if the issue is resolved.

Adjust Parental Controls in iTunes:

1. Open iTunes.
2. Access iTunes preferences:
   1. On a Mac: From the iTunes menu, choose Preferences.
   2. On a Windows PC: From the Edit menu, choose Preferences.
3. Click the Parental Controls tab.
4. Remove restrictions on Parental Controls.

I would suggest looking for an unplugged or leaking vacuum line somehwere around the intake manifold.

Try google chrome.

The 306 Error Code is generated when any corresponding process or operation could not be completed successfully by the application.

error 306 may prevent the user from performing the required action or may the application will close unconditionally.

Technical (Deep) Description of Error Code 306:

This is a full Description of ERROR 306:
ERROR 306: MCIERR_DEVICE_NOT_INSTALLED.This error is due to .The default facility code
ERROR 306: EVENT_APPMGMT_UPGRADE_COMPLETE.This error is due to Application %1 from policy %2 successfully upgraded application %3 from policy %4..The default facility code
ERROR 306: SQL_306_severity_16.This error is due to The text ntext and image data types cannot be compared or sorted except when using IS NULL or LIKE operator..The default facility code
ERROR 306: ERROR_SECURITY_STREAM_IS_INCONSISTENT.This error is due to The security stream for the given volume is in an inconsistent state. Please run CHKDSK on the volume..The default facility code
ERROR 306: CO_E_LOOKUPACCNAMEFAILED.This error is due to The system function LookupAccountName failed .The source of the error code is an RPC subsystem.
ERROR 306: STATUS_LOGON_SERVER_CONFLICT.This error is due to The Netlogon service cannot start because another Netlogon service running in the domain conflicts with the specified role. .The default facility code
Fixing Error 306 manually is a difficult process and it is not recommend unless you are an expert in this field.
click start control panel administrative tools computer management then select event viewer this may vary depending on what operating system you have
extend the events there you will see errors in red you will no what exactly what the error was and at what time it occured
you might be able work your way through the problem
if you need more help with this post a reply with the error message details
hope it helps

indicates that the valve timing is no spot on
what about reading the fault codes

When you attempt to print from your Canon Printer using a Mac, a message appears stating Error 306. Solution

1. Click the Apple icon in the top left of the screen.
2. Click System Preferences.
3. Click Print & Fax.
4. If the padlock in the bottom left is locked:
   Click it, enter your password and click OK.
5. Click the - button. to remove the printer and the + to add it again leaving the options on default..

error 306:The error indicates that the system can not find the file for your application.uninstall the app and try to reinstall it.my recommendation is to use google chrome because it has inbuilt O.S.
regardsgolu_fixya

Error 306 is a communication error and should have nothing to do with the cartridge. Check to make sure the printer is plugged in and restart your computer, and try again.

I would go with the ones autozone gave to you.then I would check the coil packs for those 2 cylinders and see if that's the problem. If that ain't the problem then I would check the crank sensor

A communication error has occurred. reinstall drivers or change usb cable