Ford Repair: 1998 MUSTANG GT, mass air flow sensor, mass air flow

Question
1998 MUSTANG GP V8 WITH 4.6L AUTOMATIC.  HAVING PROBLEMS WITH IT STAYING RUNNING.  IT CRANKS OK, BUT THEN GOES DEAD RIGHT AWAY.  HOOKED IT UP TO ONE OF THE HANDHELD COMPUTER UNITS, IT GAVE US 3 ERRORS: P0113 INTAKE AIR TEMP SENSOR 1, P0102 MASS AIR FLOW SENSOR, & P1507 IDLE AIR CONTROL UNDERSPEED ERROR.   WE REPLACED BOTH THE SENSORS BUT ITS STILL HAVING PROBLEMS.  ANY SUGGESTIONS?

Answer
first don't replace sensors without checking them-most maf sensors can be cleaned-don't usually have to much problems with iat sensors-clean throttle bore-clean iac motor-check for vacuum leaks-remove both neg and positive battery cables touch them together to erase fuel trims in memory-reconnect and go drive around for awhile it may stall a few times but then should be ok-if you have a k & n air filter install a normal filter.