2003 Saturn Vue Intake Manifold

Repaired leaky valve cover gaskets and in the process had to remove intake manifold. I diid not replace intake manifold gasket, I am thinking the intake manifold gasket is leaking because I have because I have service engine light on solid and low engine power light on solid. The car starts and only idles with no throttle response. I am going to replace the intake manifold gasket hoping that willl resolve the emissions light problem and the throttle response problem - The question is am I going in the right direction?