Hello, so I have an 04 Range Rover. Last week I had a misfire and an engine code that said cylinder 1 misfire. So I replaced the ignition coil but not the spark plug because I recently replaced all of them a few months back. After I replaced the coil the misfire went away. About a week later my vehicle starts to misfire again (or at least I think it is) but there’s no check engine light. It only misfires from about 1500 RPM and lower. Any suggestions?