Ok I have a 1990 3.1 v6 Rs Camaro with an idle problem. The problem doesn't happen until after the car is warmed up. The idle is inconsistant, at times will loose RPMs and/or "Burrble", and on occasion it will die.

So far we have done a complete top end rebuild with a new cran compucam, new wires, cap, rotor, and cleaned the injectors, for an unrelated problem about 15,000 miles ago. 4-5 weeks ago we had the dealership replace a broken valve spring. We just completed replacing the fuel pump per the dealers recomendation, on this problem. It was producing low pressure and was about to go out.

Anyone have any ideas what might be causing the problem? or what should we check next?