After a few minutes the engine is running on 2 of 3 cylinders. Top plug electrode(flat plug) is filling up with some sort of debris that looks just like melted solder. Any searches I've done are unrelated. I can clean the plug with a wire brush and it will run perfectly for a couple minutes. Then, same issue. I added a fuel filter to verify it wasn't just bad gas. I swapped out coils with a spare to try to rule out an ignition problem per a spark plug diagram I googled. Running too hot? Water pump is working per peeholes. Any direction to look next? Any suggestions at all would be greatly appreciated. Thanks.
