· W163 and General M Gremlin
All these era rides need to have all the vacuum lines swapped
Q: Have you addressed your eco-wire issues in the main harness, throttle body and lower starter harness?
Diagnosing any issues with these still being used will mask any troubleshooting events you take on.
Your codes indicate possible clogged cats:
Temps fore and aft of your cats.
Post the temps.