try checking out your engine running in a dark surrounding,and see if there are any sparks,around the plug wires..that'll tell you if one is bad...also did you check all of your vacuum lines,one may have come undone during your work...
and if you do need wires...i strongly suggest the 9mm's...they are far superior to those crappy autozone etc. wires,and are about the same price..got mine from bill at chicago connection(1-773-229-0655)great service,and only took 3 days total to get them(well worth the wait)got shipped for just under $50..