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: 130,778 (55,000–217,000)
Exhaust & Emissions affected: 3.8L V6
9 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004, 2005, 2006
23 people reported this problem
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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 ?
2003 Chevrolet Monte Carlo 99,000 mi,
CHECK ENGINE LIGHT IS ON HAD IT CHECKED VERY THING IS FINE DON'T UNDERSTAND WHY LIGHT IS ON
1999 Chevrolet Monte Carlo 170,000 mi,
When I drive my car it feel like am not getting much power, feel like am losing power like its down accelerated
2006 Chevrolet Monte Carlo 85,000 mi,
no heat when car is at an idel.. enigine light is on