My Dad has a 2000 Dodge Durango V8 that is having a problem. While I was out in his driveway zainoing my car he came home and did whatever he did inside and then went back out to go to the store. When he tried to start it nothing happened... it tries to start and clicks and it started once or twice but if you let the idle drop below 2000RPMs or so it would shut off. He said a check gauges light came on earlier in the day and the manual says to check to make sure things were properly charging, he said they were. Seems to me that it's not his battery or starter... could be the alternator or some kind of sensor/computer part? Any ideas?