P0304 CADILLAC - car hesitates and chugs while trying to pass

Question

car runs fine during normal driving. Only when I try to accelerate will it act up

Answer 1

Hi there,

This code is for a misfire on cylinder #4. Many times the coil is the issue when you have a single cylinder misfire. Especially when the conditions are met to make it fail. In this case heavy load is causing the issue. I would either replace the coil, or move it to a different cylinder and see if the misfire moves with it.