Honda Fit 2002 jerking problem?

My 2002 automatic transmission Honda Fit has recently been jerking or jumping a bit when I accelerate. I have taken it to the mechanic and he hooked it up to his diagnostic checker that finds faults and it didn t show anything but it is now happening more and more- every time I accelerate to get on the motorway it jerks multiple times in a row. It doesn t feel like it s going to cut out, it just feels like a strong jerk as I accelerate. Does anyone know what could be causing this? Or has anyone else had this problem?
*The mechanic checked spark plugs and said they looked fine, the car also had a brand new transmission 2 years ago so it shouldn t be the transmission.

Thanks in advance!

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