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My motor rise up and down like if someone was pressing the gas and releasing it

(1997 Volvo 960)
in Decatur, GA on April 27, 2012
What could be causing the motor to do this/
Displaying 1 answers & 1 comments
Popular Answer
of Greg's Orange Auto on April 27, 2012
A VAC LEAK WOULD MAKE IT SURGE OR IDLE CONTROLS, LIKE DIRTY THROTTLE BODY OR MASS A/F SENSOR
on April 27, 2012
Thank you so much I will have the idle controls checked.
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