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2008 1.2 micra hwlp

Hi all

Newbie here, I have a 08 Micra 1.2. I have changed the throttle body and also the accelerator pedal and sensor.
the car struggles to start and drive forward. it did drive no problem but now just struggles to drive in any gear.
I have No codes coming on the dash.
I have been told this could be the ECU or even the cat.
any help would be much appreciated