I have a 99 GTX RFI that has begun to have fuel issues. It will run fine most of the time but will suddenly die, especially if you are under 20 MPH. It will restart if you hold the throttle wide open. My mechanic has the same problem with his RFI. It appears to be fuel related. That is, it is loading up and flooding the cylinders. Does anyone have an idea what to look at repairing on the fuel injection, i.e. the pump?