Cadillac Repair: fuel filter, model engine, fuel filter

Question
My cadillac is sputtering  

Answer
I need the following information:

YEAR:

MODEL:

ENGINE SIZE:


IS or HAS the CHECK ENGINE light ever illuminated while driving the vehicle and or has any other lights illuminated or any messages from the message display center ?.

What work or diagnostics of ANYKIND WHAT-SO-EVER have been performed on the vehicle trying to fix this problem ?.