distributor question

[junkyardpartseeker]

On my 84 suburban, I was having ignition trouble and took it to a shop for repair. Was told my p-up coil went out and they installed a rebuilt distributor in it. What they installed in it was a distributor without a vacuum advance. They told me I didn't need it unless I was planning to race it. Ever since, the trk has been running rough at idle and when I am stopped. It runs rough until I start gaining speed. Should I just go ahead and put a distributor with a vacuum advance back in it???