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1997 Volvo 960 Question: my motor rise up and down like if someone was pressing the gas and releasing it

 

Question

Yolandre, 2.9L 6 Cylinder, Decatur, GA, April 27, 2012, 10:49
 Rookie

What could be causing the motor to do this/

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  • Answer #1

    Greg's Orange Auto (13472 Answers) , Orange, CA - (714) 361-9386
    globalhelper April 27, 2012, 11:50
     Master

    A VAC LEAK WOULD MAKE IT SURGE OR IDLE CONTROLS, LIKE DIRTY THROTTLE BODY OR MASS A/F SENSOR

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    Yolandre, April 27, 2012, 11:58
     Rookie

    Thank you so much I will have the idle controls checked.

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