tune up help

If it did not happen before the new cap was on, put the other cap back on, I have bout new parts that was not good before, thus why I don't change anything unless it is bad..
I have bout a distributor cap and rotor that did the same thing and ran like chit, I just put my old one back on. What plugs did you use, and do you have drool tubes ?
If you have drool tubes I remove the washer.