I have a 2004 Dakota with a 4.7 engine and 270k on the odometer. My issue... when at a stop in drive the engine RPMs will slowly begin to drop and if left in this state the oil pressure light will come on and it will stall. If I shift the trans into either neutral or park the RPMs will come back to normal and all is good. Now this doesn't happen every time and will usually only happen if stopped at a light for some length of time. I have replaced the MAP sensor, Throttle Position Sensor and Idle Air Control Valve and cleaned the throttle body and so far this has not remedied the problem. Other than this vexing issue the truck runs fine. One other interesting note. If the air conditioning is on the problem does not manifest itself. Has anyone experienced this problem and if so what solution solved the problem.

 

Were the TPS and IAC replaced with a Mopar units? When were the spark plugs last replaced? Rent a fuel pressure tester from the auto parts store and test fuel pressure. Rental should be free when you return it.

 

The spark plugs are recent and may have 30k on them. The TPS and IAC are not MOPAR. As an FYI the ignition coils, fuel injectors and fuel pump are OEM and have never been replaced. I will check the fuel pressure but due to other priorities it will be several days before I will be able to make that happen.

 

You do want the Mopar parts if at all possible, especially with the TPS. 30K is the plug interval, so might as well eliminate that possibility too.