Hello, I have a 2005 Corolla LE with the 1zzfe, it has 191k on it and I’ve recently gotten a very bad misfire. P301, and stated by the reader I replaced the plugs, which had oil on them, replaced the valve cover gasket and tube seals, with the code remaining. The code then shifted to a misfire on Cylinder 4 which was fixed by swapping Cylinder 1’s ignition coil and replacing the faulty coil with a new one. Code still reads a misfire expect now it’s for Cylinder 1. Checked fuel injectors and none of the seals are cracked, idles rough, no smoke out of the exhaust. Please help if you have any advice that is also greatly appreciated!