I DID A SIMPLE TUNE-UP ON MY 07 INFINITI G35X I DID AN OIL CHANGE REPLACE THE SPARKPLUGS AIR FILTERS AND CABIN FILTER WHAT CAUSE THE IDLE GO UP TO 1500 RPM
Tuesday, January 15th, 2013 AT 2:19 PM
Usually that's caused by a vacuum leak. Check for any vacuum hoses that fell off, you forgot to reconnect, or are cracked. Small hard plastic hoses often crack when they're bumped or pushed around but they shouldn't be too brittle yet on a car as new as yours.