Having problems with my 2003 3.5L pathfinder. Has following symptoms:
OBD Codes: P1217 Manf control Fuel Air metering - displayed twice once with the P1217 code and once with P1217p/d - whatever that means. Also has Catt eff below threshold P0420.
Starts fine but after it warms up the RPM's become erratic and the engine temperature starts to swing wildly - both at the same time, with the temperature often pegging high. On stopping the car and inspecting, I do not believe the high temperature is real - no smoking or coolant relief, doesn't smell or sound hot. Really appreciate any help.
One other symptom is that the car seems to actually run/accelerate better than normal until it warms up - very strange. Car has 210K and has been running great otherwise.