my 82 has the 305 with 4 bbl rochester. Auto Trans. The AIR pump and all the plumbing are removed and, capped off/pluged at the exhuast manifolds. The EGR valve has been removed, replaced with a blockoff plate and EGR valve gasket. The vac hose to the EGR valve is pluged off. It runs fine,other that using a lot of fuel, but it idles very poor and stalls out at idle. What to do ?