2004 Jeep Cherokee Car bucks at 55 MPH

2004 JEEP CHEROKEE
80,000 MILES • V8 • AWD • AUTOMATIC
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IRRUMATE
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I have a 2004 Jeep Grand CHerokee with Quadadrive. While driving the vehicle as I accelerate between 50-55 MPH the vehicle seems to jerk or buck for a split second and then it is fine. Almost feels like vehicle has been re-ended.
Nov 19, 2009 at 12:06 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Nov 19, 2009 at 12:13 AM
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