carburettor

hi ive got an ibiza mk 2 1.4 8v now i know you can crank a lot of power from you carburettor from fitting a set of motorbike or other aftermarket carbs, however ive been told you can get a decent increase in power from tuning your standard carb, whats the best way to do this and what kind of...

What are your opinions on the best carb cleaner to use? Also what are the best brand of spark plugs in your opinion? Engine's running a bit lumpy so going to give it a service.