Hi there,
I would be checking for any set fault codes and have the coil check as they can breakdown and miss fire when they warm up, they can develop internal shorts, this is a common problem with a lot of small cars due to the excessive under bonnet temps, if the cooling system is at normal range you won't have a problem with the cooling system.
Mark (mhpautos)
SPONSORED LINKS
Saturday, July 24th, 2010 AT 7:40 PM