I have more info on the stalling issue. I drove the car to work today, 23 miles one way mostly on highway and it did not stall once. When I got to work I heard a hissing sound (screw in tire) so I then started to put on the spare tire which took me about 15 minutes. I started up the car and got about 1/8 mile and it stalled. It proceeded to stall every minute or so. Sometimes it took several attempts to start using the accelerator (and not) and sometimes it would start back fairly quickly. It never stalled while idling, only when at speed (less than 50 mph). I parked it for about 15 miniutes while idling and it never stalled. The car has 130K miles and I have never replaced the fuel injection(pump) relay , radio supression relay or the speed sensor. Any help in the diagnosis would be appreciated.