bronco boy doesnt know that much about the zetec... he did an svt swap...
also the zetec engine is known for idling rough down low... get a tune. it solves it pretty much.
with the alternator i would assume it was a bad one... it is off ebay however.... also how hard was your belt to put on?
2003 Focus Sedan - Sold but not forgotten
2014 Mustang V6 - Current