1993 Pontiac Grand Am

Engine Performance problem
1993 Pontiac Grand Am 4 cyl Front Wheel Drive Automatic

My car was dying at every stop sign. I found that a small hose (I think connected to the manifold) was completely clogged. I bought a new hose and it seemed to work fine for 2 days and now my car idle is very rough and when I turn on the air conditioner or the heater it will stall. Someone sugessted I replace the pcv valve but when I went to the auto parts store they said my car does not have one. They gave me some intake/throttle cleaner spray and it worked for that day but not any longer.