> > -------------------------------
> > START
> >         set ports and normal stuff
> >         set up interupts
> >         BSF INTCON,GIE
> >
> > MAIN    bcf     INTCON,GIE              ;turn ints off

This is not a good way to disable interrupts.  Recall from the datasheet
(any datasheet) that the bit may get set during this operation from the
interrupt, preventing it from being cleared.  This may not be your problem,
but it never hurts to be correct.

Try:

MAIN  bcf INTCON, GIE      ; clear bit
      btfsc INTCON, GIE    ; is bit clear?
      goto MAIN            ; if not, try again

> >         nop
> >         check for external signal w     ;part of my code
> >         nop
> >         bsf     INTCON,GIE              ;turn ints on
> >         nop
> >         call loop                       ;call sub
> >         goto    MAIN                    ;go again

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