ecm

Gjac wrote:
Joe you have OBDI. If Google search Chevy ODB I eng service codes you will get generic codes. To retrieve codes you jumper A&B terminals with a paper clip and the eng service light on the dash will flash. If you see one long flash and two short flashes that would be code 12 and that means every thing is normal. If you see one long flash and 3 or more short flashes you have a problem. Is you service eng light on now?

And let me add it will flash each code 3 times then the next code, then end in 12. write these down in order and fix the last one and clear the rest and try running again to see what comes back. Some codes create other symtoms. If yours is like the diesels check all you ground connections the electronics share this. They can cause random electrical gremlins if they are getting corroded or crusty. A little wire or brass brush and some diectric greese can do wonders. a little electrical contact cleaner sprayed into weather pac connectors helps too.