Get torque pro for Android, an obd2 blue tooth adapter and read the MAF sensor. Gde stated this: "the factory [is] 18.2g/s flow number [...] Flow rates below 15 g/s most likely exhibit some degree of rocker wear. Below 13g/s and all the rockers are wasted." You should read the MAF when engine is idling. If you have low values, either your intake is clogged with egr soot (diesels do this a lot), either you rockers have wear. Either way, you'll have to take out the valve cover.
If you don't have an android phone, maybe you have a friend with one, torque pro is less than 10 bucks on google store and a decent obd2 adapter (eBay, Amazon) less than 20.
_________________ 2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.
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