When I bought mine it was running like a bag of crap sluggish and misfiring so I changed the coil pack aswell and the HT leads, the coil pack was £19 and with the HT leads and plugs £35-40 in total. Personally I'd get NGK plugs cost a little more than the bosch plugs but they run better and the vss was £32 off eBay but that didn't come with a new pin that holds it in so I got 1 from the local ford dealership was only £1.20, all easy to replace really