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

What could be causing the motor to do this/

by in Decatur, GA on April 27, 2012
1 answer 1 comment
ANSWER by on April 27, 2012
A VAC LEAK WOULD MAKE IT SURGE OR IDLE CONTROLS, LIKE DIRTY THROTTLE BODY OR MASS A/F SENSOR
COMMENT by on April 27, 2012
Thank you so much I will have the idle controls checked.