Question about 2001 Saturn SL

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Why rpm fluctuates?

Rpm fluctuates always on drive mode and when the a/c starts.gets jerks with accelerates

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Static electricity or electricial interfearence.

Posted on May 13, 2014

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1 Answer

I have a 2003 Chevy Malibu when i'm driving down the road about 55 mph the vehicle jerks and the RPM's start to fluctuate


You have a clogged fuel filter. Easily replaced, check to make sure you have one or two.

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This is a rare one and can be tricky. Since your rpm gauge rises back up when you increase your acceleration slightly but you feel no jerking of acceleration then this tells me that a speed/rpm senser either has a bad connecton or the sensor itself is going bad when the engine reaches an optimum heat while driveing on the highway. Since you feel no acceleration when you slightly press the accelerator down but yet the rpm gauge is increasing back to normal, the throttle body sensor may be compensating for the failed speed sensor/failed sensor connector. Please get your uplander diagnosed properly first to confim this.

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I would look for a fault in the ignition system such as a cracked spark plug. Might need a scope check to put your finger on the problem

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