whee does this 1 purple plug go ????

[bwenny 23]

hi i have a vy v6 ecotec engine i just put bak in and theres 1 purple plug {ped 19 a/b} i dont know where it goes can sum1 please help....
it runs adjacent to the large plug that goes past the coolant bottle ..

[Burnout124]

air temp sensor on the top air box ? or air flow sensor

[fuzzy2308]

post a pic of the plug. sounds like the airbox plug