Having an issue with the idle in my 92 z28 5.7L Camaro.

Cranks fine and idles fine, after I get going and come to a stop, the car acts like it wants to die. On the road it shakes slightly.

I changed the spark plug wires out. Well 6 of 9 of them. The ones I could reach. The rest look ok. I checked the rotor cap. Not sure what else it could be.

If you need any more info for diagnosis, I can provide more.