Car started to run on 2or3 cyl but never stalled

Hello, Since all you know is that the engine is running poorly, there is really no definitive guidance I can offer. Start by scanning for trouble codes, you can post them here if you'd like, and I will have a better idea of what your vehicle is doing. Next, you will need to isolate the cause of those codes. You could have an issue with the ignition coil, plug wires, or plugs, sure, but this could also be a fuel delivery issue, intake manifold gasket leak, bad PCV valve, or a number of other items. Best to diagnose the codes before swapping parts.