Reverted back to MR2 rom from custom kitchen...

[sdruid]

I was having problems with my phone randomly rebooting itself and I flashed it several times with the kitchen with no improvement, so I finally called verizon tech support. They said I needed to upgrade my firmware and directed me to a site when I could download a rom to flash my phone with.
I flashed back to MR2 and the phone works fine now minus all the goodies that come with the kitchen...oh well...
I think I know what went wrong and why my phone kept rebooting but I'll that for later in case I want to go back to a custom rom.
Do I need to downgrade and upgrade every thing again (radio, etc.) if I go back to a custom rom ?
My issue now is that my GPS no longer works. I was having problems with it about the same time my phone was randomly rebooting.
Now that I have a stock rom how do I get my GPS back ?
Now that I have flashed back to MR2, what is the status of my phone ?
Did I lose the radio and the Agps that I flashed before ? where does my phone stand now
- stock rom ? or custom (even though I just flashed to MR2) ?
is it completely a phone with a stock rom now ?