93 2.3L SOHC knocking and stalling at idle

On the way to work Monday morning my 93 Grand Am started to knock and ping and lose power. When accelerating from a stop from idle it was the worst. It was especially bad if the A/C was running. I found the one vacuum line going from the little black box on top of the engine to the intake manifold had a crack in it. I changed all of the vacuum lines going to the black plastic box. The old lines were degraded and falling apart. I have about 150,000 miles on the car.

Does anyone have any idea what I need to do? I already checked the plugs (they are only about 3 months old, and I checked them again yesterday). At this point the knock is so bad that the car is pretty much undrivable, not to mention that it stalls at idle.

Welcome to the forum. There's several possibilities. My first guess is that you might have a bad crank position sensor. other then that:

wires
coil packs
ignition module