Today i got my CEL read, which has been on and off for the past week or two, and it came up as a misfire on cylinder 1,2,3 and 4 and its running lean. Recently had the cars front bumper fixed after an accident and when i got it back, its been throwing this code. I have no idea what could be causing all 4 cylinders to misfire. I have a VF-34, 3in Turboback, STI injectors and intercooler, and K&N intake with a ECUtek tune which was all done before the accident. Any idea what could be causing this?