Make sure the Evaporator Purge Valve and the Idle Air Control (IAC) valve plugs are not switched around. They are the same style plug both have two wires. Both valves are located on the back of the intake manifold. The IAC is close to the throttle body. The EPV is the little black plastic sensor held on by a screw to the far right of the manifold. It has a black circle shaped filter on the top of it.