Car is a 1992 Camaro with a 305 TBI engine. Idles rough and wants to stall when cold. Had this problem in December and replaced the coolant temp sensor, distibutor cap and rotor. Plugs looked good. Fuel pmp was replaced at about 20K miles ago along with an ac delco egr valve and a new computer. What else should I look for causing the problem. Idles fine and run fine when warmed up. Car has about 140K miles.