Corsa C Z14XEP hesitant and feels sluggish?

hi.i have the 1.2 twinport version.mine does exactly the same as you mention.sometimes it runs great and pulls well and feels smooth,but sometimes feels sluggish and boomy.from experiance i spray carb cleaner into throttle body then take it for a high rev run.mostly seems to cure it.i think they are suseptable to sooting up if you do a lot of stop start driving.mines at 100k miles!hope this helps.

martin hall
August 2010