1999 Grand Marquis - Hard Start/Stalling Problem

My car just developed this problem on Thanksgiving. Very hard to start and stalls if you don't hold open the throttle. I can drive the car but I must put car into neutral and race the engine to keep it from stalling while at a stop. Almost feels like something is choking it. When driving, car runs OK, but seems to have some power loss. Car facts: 85K miles, 4.6L V8, CEL off, no prior problems.