EGR Systems
Chevy Impala
Chevy Astro
Ford Expedition XLT

What would cause your 2000 Impala with a 3.4 to not idle and sometimes idle very fast - you tried changing the PCV valve which seemed to help temporarily?

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Answer

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Wiki User
04/09/2007

Check the EGR valve. also, make sure there are no vacuum leaks The engines mass airflow sensor(its located between the engine inlet and air filter)