147 overheated and now miss firing
New on here and got a problem with my 147 '02 plate. Had it about 5-6 years now and it's never given me much trouble but I recently was sat with the engine running after a 45 minute drive when a warning message came up on the dash. Can't remember exactly what it said but it related to the temperature. The temp gage had shot to the top so I immediately turned the engine off.
Having left it 10 minutes I checked the water level and it was low. It wasn't a full-on overheat with water and smoke everywhere but the water was low. I topped it up and it's been ok since.
However, since then the engine has been miss firing a bit. The regular engine noise when I first start the car up drops for a second or two at times. The power is miss firing at times too when accelerating, especially in lower gears.
Any thoughts on what this could be would be greatly appreciated.