The most common culprit is carbon buildup on the throttle body, exhaust gas recirculation (EGR) valve and idle air control (IAC) valve. Here well show you how to clean an EGR valve.

You'll also find them in emissions control systems, managing exhaust gas recirculation (EGR), and in Honda VTEC and Toyota VVT-I variable valve timing (VVT) systems.In the Chrysler 5.7-liter HEMI ...