If it happened after a fillup it might just be bad gas. Hook your fuel preassure tester back up, run the purge hose to a safe location, make sure you dont have any leaks, start the viehical. Put a zip tie around the purge button and drain the tank with the engine running, check the fuel if it smells at all bad thats probly your problem, it could also have alittle water in it. If that dosnt help, ill run you through some more things to check. Also check all of your plugs in your electrical system, throw some dialectric grease on every plug you can find. Ive even done that to all of the tranny plugs. Electrical problems are a bitch to diagnose when you have bad conections. Spend an hour or 2 going through it all. Trust me, ill help you fix it, screw paying some one to fix your VX. I also had a problem with the wiring harness near the tranny, it melted because the factory has it to close to the exaust, it caused tranny problems. If you have a short when you put it in gear that could also cause problems. Does it stall when you put it in drive, or just reverse.