[Joebe]

You've described my symptoms on my '94 Isuzu Rodeo to a tee. Chiltons tipped me to the ECM default mode also. I don't get an engine light and haven't checked codes. Bought at a good price couple of weeks ago because prior owner basically gave up after replacing lots of stuff from fuel pump to coils, wires & plugs and most of the sensors - but not the ECM. Before spending the $300 or so to replace or repair, does anyone know how to test the module or who might be able to? Any help would be appreciated.