using v max unleaded and that is as far as my mechanical skills go so got no hope of checking my intake pipes !! .
It's a little difficult to judge on the detail given. If it's a brief hesitation that could be because of the way the standard car is programmed to have a lazy throttle response in the first 3 gears and an uprev re-map would help that (the car doesn't use a throttle cable - you pushing the throttle simply send a signal and the ECU then tells the engine/fuelling what to do). Equally, if you have some sort of after-market air filter, which is open to the elements inside the engine bay (ie. not inside a box)you can get some heat soak which can make the car hesitate when you put your foot down (that can be particularly noticeable in hot weather). If it's a really noticeable coughing and spluttering that would need to be looked into more. Good luck.