1998 Jeep YJ • 6 cylinder 4WD Manual • 127,000 miles

1998 Jeep Wrangler engine hesitation
While driving and/or accelerating from a stop, my Jeep will start to chug, the rpm idle when stopped will jump up and down as it chugs. As if it does not want to continue, I pull over, hold gas pedal to get rpm up between 2 and 3, hold it there for a few minutes, then it will clear out and run great. It is a 5 speed, have replaced ignition sensor and O2 sensor, thinking thats what it was
February 18, 2011.

Could be caused by one of the following below

Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note: If it doesn't apply disregard it and keep testing

Feb 18, 2011.