The codes you mention 301-302-303 are all misfire in the respective cylinders. you should replace the coil, while you are at it also verify the condition od the sparkplugs.
Obdii-code-p0351-x2-704058/index4.html">http://www.jeepforum.com/forum/f13/help-obdii-code-p0351-x2-704058/index4.html
This thread basically says replace the crank position sensor and the cam position sensor. Check the wiring for the Oxy sensor(s). And if all else fails then change the PCM.
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