i was having problems with it idling when it wormed up, coming off high RPMs it would die. So i pulled the intake plenum off to get to all the vac lines and look for leaks and replaced some old ones. Now the thing will not idle and when it runs it runs real ruff. i pulled one of the vac lines off to see if it made a difference and it idles but still runs ruff. where should i start.

 

update put new plugs in. helped alot. now it idles when i start it but if i get on the gas at all it will die when i let off. If i pull a vac line off it will idle smooth.
help