My trusty 2003 Ram 2500 with Hemi just started flashing the "lightning" warning light along with a check engine light. Some cursory internet searches say Throttle Position Sensor. While I can easily swap out the sensor, what other troubleshooting might you recommend? I'm mechanically inclined and have a pretty good electrical meter. I don't have access to a scanner close by.
Truck has 100K miles on it. It is still running fine.