Electronic Air Control Valve = EACV. It is located on the intake manifold just behind the injectors with a 2 wire connector and has 2 hoses running from it, 1 to the Fast Idle valve next to it and the other to the throttle body lower end. Removal is not difficult.
I forgot to mention about the fans running after engine is stopped. It most probably is due to a bad fan relay, sticking in closed position, or there is insufficient coolant in the system which might relate to the surging.
Surging couls also be due to idle speed set too high. Check the base idling speed with EACV disconnected.
Sunday, January 5th, 2020 AT 7:10 PM