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?



User Avatar
Wiki User

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)