Ok so to start it off I have an 03 grand marquis about 106,000 miles. Sometimes when I accelerate up to like 50mph my car starts to like jerk or stutter a bit but after I push the gas some more it accelerates and rides fine. Also happens when I slow down a bit and then hit the gas it stutters more.
This is what I've done to the car since this started:
New Spark Plugs
New Fuel Filter