Hi ging, I'd like to help you out with this problem, but I need more information, so can you answer these questions? Does the engine crank at normal speed?Do you see any warning lights on the dashboard when it won't start?Did you replace the battery recently?Do you have a smart key, and when last did you replace the battery in the key?Does the problem only happen when the car was parked in the sun?Does the car run normally once it does start?Does it run normally all of the time?Does the idling fluctuate, or does it idle unevenly?Has the fuel consumption changed at all- does it now use more fuel than before?Does it take three or four attempts to start it when it won't start, and do you smell fuel when it does not want to start?How long do you crank the engine for when you try to start it?There are more questions, but these should do for now.