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My dodge is setting a code p0175. The engine runs rough. What is causing this?

(2004 Dodge Ram 2500)
in Houston, TX on January 26, 2013
I have replaced all 16 plugs, spark plug wires, coils, o2 sensors, and the PCM has been flashed with the latest software. The map sensor is reading 15.0 inHg, and the ECT is at 192F. Any input would be great! Thanks.
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Popular Answer
check the valve springs, The hemi has valve spring problems that causeit to go into limp mode. It will run but rough, and you will get al kinds of ghost codes as I call them. The problems just aren't really there. If you find it is the vavle spring, check with you local machine shop to see if they have to after market valve spring with the girdle around it. These are made to stop this problem.
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