Try resetting your ecu - probably with additional air the afr/ timing is messed up

The ECU is using your old ratio of 1X air hence pump 1Y petrol, with your new intake you are sucking 1.5X air but still pumping 1Y petrol hence your timing or Air/Fuel ratio is 'out'. Your ECU need to relearn the ratio, it does not mean your ECU is rosak

Don't need to go to w/s , just disconnect the clock fuse (if you know where it is) or disconnect you battery terminal (-ve) for 10 minutes and reconnect, go for a spirited drive (rev hard afew times) and the engine should run smoothly.