The car is flooding when trying to start it. what could this be?

Really best retrieve the check engine codes. That will lead you to the problem.

As Dan said if the Service Engine Soon/Check Engine light is on a scantool is needed to retrieve trouble codes stored in the computer in your car. But even if the light is not on a professional grade scan tool allows key engine sensor data to be analyzed right off the scan tool without having to do intrusive testing at each sensor.

Temp sensors might be something to look into.