Quote Originally Posted by peterdeco1 View Post
It looks like the 16F88 needs a minimum of 4V to operate. The 16LF88 needs only 2V. Try the LF part, use 3.3V for both and turn off Brownout Detect.
via the data sheet for the PIC16LF88-I/P on mouser's site i do now, see the pic16f88 listed at 4V.

thanks