2000 Dodge Durango Stall after Radiator Replacement

My vehicle overheated one evening, and I immediately pulled off the road. Coolant was leaking out after I pulled over and there was still considerable volume. I had the car towed and the radiator replaced. I picked the car up that evening and drove it about half a mile to my home, and it stalled as I pulled it into the garage. I had not had stall issues for 3 months since replacing the IAC module. The fuel was also running rich, which had not been doing prior to the radiator replacement. Any ideas on what could be wrong? No check engine lights, and I can detect only a minor change in the engine idle when I turned it back over (so slight that a very skilled mechanic would not notice the idle was off).