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Q: MY Van Is idling rough on 2004 Dodge Grand Caravan

My check engine light came on and my van started to idle rough and then started to do it while I'm driving it. (little jerky movements) I took it to a garage to run the computer on it and they said that I needed to replace the fuel filter, spark plugs, and wires. I've only had it 2 years and when I got It one of the first things I did was replace the spark plugs and wires. I would like to replace the fuel filter but can't find where it's located.
Here's what the computer said when I had the garage run it due to the check engine light being on
P0300- Multiple Cylinder Misfire
P0303 Cylinder 3 Misfire
P0522- Oil Pressure Sensor Low,Would need Further Time To Completely Check This Out
DTC-Codes That Couldn't Be Cleared
LR Wheel Speed Sensor/Signal Malfunction (MY ABS LIGHT IS ON)
RR Wheel Speed Sensor/Signal Malfunction
Hydralulic Pump Circit Malfunction

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