2001 Mazda Other

Engine Performance problem
2001 Other Mazda Models 6 cyl Front Wheel Drive Automatic 98000 miles

my car surges while sitting and idling. It cuts out while im driving. I took it to the shop and they told me the cadillac converter could be stopped up on it, it just needs a tune up but I just changed the plugs and wires in it and no change in performance has happened. About a year ago we had the fuel pump changed in it and one of my friends told me that they either knocked something loose while changing out the pump or they really didnt change out the pump. What are your thoughts on the subject
June 21, 2010.

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