Hi, so a month ago my car was having problems. It was shaking and the engine light was on. I figured it was an ignition coil and i changed the one not working after consulting with a mechanic. But the problem still didn’t fix. I then changed all the spark plugs and my car started working good. Now after a month i have the same problem, my car is shaking. Do i change all 4 of the ignition coils?
Do you have a fault code for misfiring? Try swapping coils between that and another cylinder. If the misfiring follows a coil it’s a bad coil. If not check plugs, (compression), wiring to coils, and fuel system.