04 taco starts and dies

my friends 04 4wd, towing empty trailer, engine died, A/T temp light came on.Now it starts but dies immediately. I checked the A/T fluid temp sensor . It read 10k cold. same problem trying to start with sensor unplugged. Will this sensor cause this symptom or are we looking in wrong place.thanks . Checked fuel pressure and its good. No check engine light or codes. engine fires right away when starting. Even if I keep starter engaged it dies. Accellerator makes no difference.?