My 2003 T&C 3.8L Limited recently lost power when going above about 25mph. No Check Engine lights come on so far. I have narrowed the problem to the engine, which starts to sputter at around 2000rpm while gear shifted at Park, no matter engine cold or warm. I have changed spark plugs, spark plugs wires, PCV valve, throttle position sensor, MAP sensor, and the problem still exist. Last weekend, I replaced the fuel filter and measured the fuel pressure which is 54psi at idle or 2000rpm. Now I don't have a clue what to do next. Please help and thanks in advance.