thanks Chris... I'll re-verify the intake vacuums and check the fuel and the exhaust manifold. I had heard the temp sensor may be at fault; this makes sense. I used to have an '88 'vette that the ECM had a cold mode and a hot mode. During cold mode the ECM ignored inputs like mass air flow, O2, etc.. I assume that MB is similar in setup.
Since there are 4 wires at the temp sensor, would you know which one is most likely to be the culprit?