im putting my tbi back together after a failed tpi swap. actually i thought i would upgrade after i warped the heads and manifold of the tbi. so i bought a tbi intake off of ebay and they guy sent me some sensor with the manifold ill attact an image. it has two vaccum lines what do they connect too? another thing..... i notice two vaccum lines coming out of the fire wall. what are they for? what do they connect to? thanks for any help

 

It's your EGR solinoid switch. It's an electronic valve that opens EGR, it's all computer controlled.

 

they vac lines coming out of the firewall are for your heater controls.one will run to your intake and the other will run to your heater control valve.