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1999 Jeep Grand Cherokee Laredo 4dr

1999 Jeep Grand Cherokee
Trim Info:
Rear Wheel Drive, 4 Door, 2WD Sport Utility Vehicles
16 mpg city / 21 mpg hwy
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June 2, 2013, 4:04 pm

Ryan H
 

Question: Why am i losing power when accelerating?

my '99 jeep grand cherokee laredo will lose power when i accelerate. the rpms will drop and jump, and when the rpms jump the car will jump forwards. also while this is happening, when i press the gas pedal there is a sort of knocking sound underneath. while the rpms are jumping around, if i come to a complete stop it will idle poorly and will shudder slightly. it does not die completely though. it is only when the car has sat for a few hours. once it has warmed up, so to say, it will not happen. i've used gumout hoping the engine was just dirty and this did not help. please help me! i am leaving for college soon need to be able to rely on my car!!


June 2, 2013, 8:57 pm

Tyler O
Expert Mechanic

Strange problem... Start by checking the engine computer for fault codes.

If it goes away when warm, you might have a bad temp sensor or maybe a problem with an ignition system component.


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