Have FICM programmer/ECM rollback...ficm is dieing.

[jtbenfie]

I bought the gryphon FICM tuner and had Bill rollback my ECM not long ago. Now that it is getting colder(especially this morning) my ficm voltage is dropping BAD. After checking out my batteries, and alternator and watching the FICM voltage, Im sure its the FICM going bad.

I can get a new one thru a friend who works at the local ford dealer cheap, and I have another friend with an IDS that can program it, but....

Is it going to erase/write over/try to update my PCM when I install and program the new FICM? Will my FICM tuner still work as long as I return the old FICM to stock before I change them out?

Thanks
Josh