Stalling problem 1993 Saturn SL2

I have a '93 Saturn SL2 DOHC.

The problem I'm havnig is the car will usually start and idle fine, but shortly there after when I come to a stop the tach drops very low, the engine stutters and then will stall.

Ocassionally the car will start and die immediatly unless I hold down the gas pedal.

Car idles fine when cruising.

I Changed the plugs and wires. Mechanic tested and changed the serpentine belt tensioner which did not help at all. :(

Anyone have any ideas?

thanks. Al