I purchased a 1986 IROC, with a 305 TPI engine. The exhaust gas recirculation system had been removed but the EGR valve in still install on the intake manifold. Its not connected to anything.

Could this be causing a rough idle (or surging) when the motor reaches normal operating temp? because when I first start the engine it will idle with no problem.

Can the EGR valve be eliminated all together without affecting the engines performance?