The most likely cause of low-power, when under load, in your Cummins N14 diesel engine is a lack of fuel. The problem can also be a lack of air flow.
Fuel or air.
There are several things that can cause low oil pressure on your comments 5.9 liter diesel engine. The most common cause of low oil pressure, when under load, is a faulty turbo.
Engine Position Sensor.
A few things can cause this problem, stuck open wastegate, excessive blow-by or an air leak on one of your intake hoses.
Broken head gasket...since an ISX with 200 miles is still under warranty, let Cummins fix it.
Basically, year of manufacture and what emissions regulations they had to fall under. Pre-2003 ACERT motors are your red tops, whereas Cummins designated their line of diesel motors as a whole new series under the post-2003 regulations (the N14 became the ISX, the M11 became the ISM, the L10 became the ISC, etc.).
On the Cummins diesel the crank sensor is located in the side of the block under/behind the starter.On the Cummins diesel the crank sensor is located in the side of the block under/behind the starter.
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Under the steering column under the dash.Under the steering column under the dash.
Under the valve cover in the top of the head.