Has the fuel pressure sensor been replaced? IIRC the sensor is supplied with a new RH fuel rail so if that has been replaced then so should have the sensor, but worth asking the question.
Have the EGR valves been replaced or blocked? My brother has discovered that one of his EGR valves is incorrectly reporting the valve position which while it hasn't caused rough idle, it has been causing frequent reduced performance. Unplugging both EGR valve electrical connectors has solved his problem.
MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi
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