My 2000 Xterra started hesitating and acted like it was starving for fuel. I let it sit for 2-3 hours and it would run. Ran about 15 miles did the same thing. Looked underneith and the exhaust pipe, after the converter, was glowing red. Figured the catalytic converter was clogged. Had to get it home, after several stalls. Now the vehicle will not crank at. It will turn over, but not crank. Could it be the ECM?