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engines reves hesitates?

My 1994 Volvo 850 automatic will hesitate and engine reves upon acceleration then idle reduces and runs smoothly. What could cause this?
Steve, March 2008
Most likely to be the fuel pump. Fix by replacing.

ShadenFreude, February 2009
you may need a new foo foo valve.

mr magoo, June 2008
link Click here to see other fixes for Volvo.