My 99 2.5RS is doing the exact same thing. Stalled on the highway, starts like no problem then dies seconds after like its starving for fuel. I've replaced the Pump with a Walbro, replaced the fuel pressure regulator, and the fuel filter. Still no luck. Cleaned my MAF and tried unplugging my Cam sensor. Nothing has helped. My car has been in the garage a month now. It shows no codes, I'm lost on this.