Got a vaccum tester? the FSM has a great set of egr and related parts that will diagnose the rough idle. You thermostat can end up causing that if the temperature sensor doesnt get hot it wont open the egr valve. Its easy to test though and eliminates the guessing.


Sold Truck: 89 DLX extra cab 4x4 22re Automatic/ New truck 97 T100 4x4 auto Sr5