After blowing a coolant hose I had accidentally pulled off the ‘fuel tank breather valve’ off of its nipple on the throttle body plate.
The symptoms where:
-Check engine code 1222 but only at idle after 10 seconds and would disappear when throttle was given
The nipple is located on the throttle body plate from the UNDERSIDE, behind the throttle positioning sensor. The nipple can barely be seen in good lighting through the hole which I have indicated with a green arrow. No dis-assembly is required to plug and unplug this valve hose.