Hey all, I recently changed all my plugs and could within the past few months and 2 times when I started the car the engine started rumbling and vibrating violently as if a coil or sparkplug is toast.

It happened for the 2nd time this evening I turned on vehicle and after few seconds engine ran really rough...I turned off vehicle and restarted and again same thing. I then turned whole vehicle off, topped up oil (was at one bar) and restarted vehicle and the whole ride was smooth with no issues.

Does this mean one of the spark plugs or coils aren't working? It's the 2nd time it happened the last few months so I'm wondering how you would go about this. I ran OBD reader and it shows 0 faults and there wasnt any check engine or dashboard lights when it ran rough

Thanks