Hey guys, Got a slight problem with my mates car, it is a fezzy Si 1.6zetec mk 3, and it seems to have a problem reving correctly. Sometimes it will go right up the clock, sometimes it will be hesistant and then wont go above 3k, its really weird. Any ideas on what it could be? I was thinking along the lines of a sensor possibly. We changed sparks and put some different leads on there just to check, and that hasn't done anything.

Any feedback would be great. Cheers

 

try cleaning your inlet out and possably you idle speed control valve could have something to do with it?