What causes a rough idle and stalling?

I just replaced the HB and CPS on my 91 Auto. It has been sitting for about 18 months. It fired up and idled. I was a bit surpised at that. But, the starting is a little harder than it should be and the idle is a little rough. When I put the car in gear it stalls right out every time, even once warmed up. I can not move the car.

What should I look at next? Cam sensor, DIS, Coil???
I am taking suggestions. Thnx.

i had this problem...and it ended up being the Cam sensor..at least on my car.

How much gas did you have in a tank? Can be gas vapour can be vacuum leak...can be cam sensor...

I would say you need to remove the gas from the tank since thats now old gas thats a log time for it to just sit there. then try fresh gas you might find it runs better. you might want to look at the plugs as well there might be a lot of dirt and build up on them now from sitting.