I'm not seeking to blame, I'm just looking for the solution. I don't want anyone but someone with Roush expertise messing with the lump. Between Roush, Olthoff and my local Roush tech I'm confident it will get sorted out. The frustrating thing is that the car has performed flawlessly for nearly 2,000 miles except for these three instances. The first was exactly a year ago. I got caught in a rain storm and the engine began to miss. The miss worsened until the engine stalled. I limped home and parked the car in the garage. A few days later it started right up and ran perfectly the rest of the 2008 driving season, including a drive to Elkhart Lake and several laps of Road America. I attributed that first problem to rain water in the electrics. I rolled the car out this spring, warmed her up, drove 6 miles on a beautiful dry day, and the same missing-stalling thing happened. This time there was no re-start, and I came home on a flatbed.
Then the head scratching began. My first thought was that the low pressure fuel filter was clogged and the high pressure pump was draining the fuel standpipe. (The standpipe would seem to hold about 6 miles worth of fuel.) So, I replaced the low pressure filter and set out again. Once again, I got 5 or 6 miles and it quit. Back home on the flatbed.
I thought it might be the ill fated Superformance fuel pump switch, but the pump is loud and I know it was always running. I also thought it might be a problem with the hose connecting the fuel tanks, so I added gas to the driver's side tank to make sure there was indeed fuel there to be picked up. Still no-go. My theory is that the high pressure pump is somehow getting ahead of the low pressure pump, and draining the fuel standpipe before the low pressure pump can re-fill it. Both pumps come on at the same time, so if the fuel level in the standpipe is low the high pressure pump could win the flow contest and suck it dry. Also, the return plumbing from the injection runners goes directly to the upper portion of the fuel tank with a "T" connection just before the tank leading back to the standpipe. Most of the returning fuel may be taking the course of least resistance and going back to the tank rather than making the turn and recirculating to the standpipe.
However, none of this would explain why the car worked perfectly the remainder of last year. I'm thinking it's going to take more than my architect's brain to sort this out. We'll see.