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idle air speed motor might be gummed up. it controls your idle speed. remove and clean with spray carb cleaner to see if symptoms improve. Other problems could be vacuum leak or stuck EGR valve or PCV valve.
i have an impala Ls 3.8 liter and (not sure about the 3.4 liter) but mine is located in the back of the engine near the middle. and get a long thin funnel because its down a little ways.
im sorry to tell you but it will have to come out to be cleaned and if it reads bad cd on every one the lazer usualy burns out. where is where i have had good luck M&R
here you go! richie
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