picked up my sri-t yesterday and it had a management light on, op-com showed up misfire faults. multiple cylinder mifire, cylinder 1 misfire, cylinder 2 misfire, cylinder 3 misfire, cylinder 4 misfire. also had a fuel trim fault logged but its got a new front o2 sensor fitted so wasnt sure if it was an old fault.
I erased all the codes and it has driven a little funny since. its ok when it comes onto boost but under 2500 rpm its misfiring and im also hearing a little more induction roar from it. it has standard induction on it. i had a look under the car and it looks like it has a decat pipe on it. precat looks standard, could it be the decat thats causing the misfire or am i looking at plugs or coil pack?
eml hasnt come back on since i erased the faults but i havent really driven the car any distance today, prob about 3 miles max. anyone come across a fault like this before?