Check Engine Light With Code P0171 and/or P0174 on Chevrolet Monte Carlo

The exhaust gas recirculation (EGR) tube which connects the EGR valve to the intake manifold may develop an engine vacuum leak, causing the Check Engine Light to illuminate with code P0171 and/or P0174 stored.

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Average mileage: 121,834 (55,000–170,000)
Exhaust & Emissions affected: 3.8L V6
9 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004, 2005, 2006
19 people reported this problem
4 people shared problem details
my monte carlo has the check light on and dosn't run the way it should the code says i have a vaccum leak how can i find it ?
CHECK ENGINE LIGHT IS ON HAD IT CHECKED VERY THING IS FINE DON'T UNDERSTAND WHY LIGHT IS ON
When I drive my car it feel like am not getting much power, feel like am losing power like its down accelerated
no heat when car is at an idel.. enigine light is on
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