Thanks in advance for all the help. I bought my first 99 WJ 4.7 Quadra-Drive and a week later intermittently whether idling or under throttle the engine will start to idle rough and level back out or it will cut out/no power/shudder and then come back. It's not throwing any codes. Any ideas what this could be? Fuel Filter? Most other issues related would throw a code or am I mistaken?