hesitation on brisk acceleration


I have a 2006 1.6 16v picasso.140,000miles with full service history.

Gentle around town acceleration is no issue but when accelerating on to a main road etc the car gets to mid revs(I assume as there’s no rev counter) you can then hear and feel the car hesitate through the next revs then it clears again and continues to accelerate without issue.

I have replaced the map,crankshaft sensors ,coil pack and spark plugs.

Could the injectors be at fault they have done some miles.

Any ideas would be appreciated.

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