Stock-ish motor, nothing forced. So I'm getting map sensor codes and the engine runs real rich smelling. When I unplug the map sensor, it runs REALLY like ****, but when it's plugged in, not so shitty. So I multimeter the wiring, I try a different map sensor, I try an external firewall mounted map sensor vacum hooked to the IM lines, I have tried everything. In between attempts I have reset the ECU properly. What the hell is going on?