The codes that pop up are format P0xxx. Like P0123. The only lists I've been aboe to find are P1xxxx ?? 97 Dak 5.2.

The smog guy's set up tells me it is 1) bad o2 sensor on left bank and #7 cylinder is misfiring. I've never seen such detail in a factory-published code list. What up?

 

the codes can narrow it down to pretty much anything on the truc that is controlled by the ecu. the misfire could be due to bad plugs, plug gap, plug wires. anything that has to do with firing.