Is there a size limit for custom template pages?

[Joey Link]

On my site I use a Google map with the Google API overlay and JavaScript. The thing is, this has the potential to have thousands of locations on this map and in order to integrate it with vBulletin I need to write it as a custom template within the admin control panel. Everything was working great until I updated the map this last time, almost doubling the character count. I'm now up to 176627 characters and when I click save or save and reload it looks like it's saving it but just takes me back to a blank screen with a gray background and the Style Manager heading.

How can I fix this?

Here's a link to the map