i have a 96 dx coupe just did a engine swap on it d16y7 when i start the car everything is fine till it seems to warm up then i get it idle high then low then high then low when i am stopped when i get on the gas it runs just fine i have check all the vacuum lines in the car only thing i do not have is on the back of the intake manifold on the driver side of the manifold it has one vacuum piece where i can feel air coming out of i looked online and its for cruise control but i have no cruise control can someone please help me