  Flat spectrum radio quasars (FSRQs) are bright active galactic nuclei
surrounded by gas clouds within a UV-visible intense radiation field that form
the so-called broad line region (BLR). These objects emit relativistic jets
from a region close to the central supermassive black hole and through the BLR.
The Fermi-Large Area Telescope (Fermi-LAT) is sensitive to gamma-ray photons
from $\sim$30 MeV to more than 300 GeV. We have performed spectral analysis of
bright FSRQs in a 5.5 year (2008-2014) data sample collected by Fermi-LAT,
using the new Pass 8 event selection and instrument response function. Also,
our study of flaring episodes in a limited time range brings interesting
results while compared to the full 5.5 year data samples.
