limiting

hello can any one help i have a mk2 ibiza cupra, if you build up speed slowly its ok up to 5000rpm then limits,but if you try to floor it it just dont go any were fast until you take your foot off abit,its standard apart from aftermarket air filter.i have checked timing

Hi everyone,Im Rich and I have a problem with my leon 1.6 (azd),Essentially,its refusing to rev past 4k and even then I have to press the throttle through the carpet!!It also is very down on power and struggles to get past 65(on a level road,hills are embarrassing!!) I changed the plugs about...