just brought my first fiesta rs. its a j reg. nice car. there was a problem with the loom when i brought it. it wouldnt start. ive now got it started but it runs crappy. it idles ok but as soon as i give it some throttle it splutters and coughs and wants to cut out. really struglling on what to do now. cant take it to garage as its got no mot or tax. any help would be great. its bein driving me crazy for 3 days now.