Engine Performance problem
2005 Ford Escape 6 cyl Four Wheel Drive Automatic 88000 miles
When driving at between 50 and 60 miles an hour,
I let up on the gas and the rpm drop and come back
up then drop and come back up several times. I tried one time to put the car and neutral and the rpm did
not drop all the way down. I had the code checked
and no codes are showing?
Inspect and test all the following listed below: Oxygen sensor.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.