i had the same car and installed the kit with a friend of mine. i had the prob with the car running poorly on wvo - runs fine on diesel, switch over, runs badly, switch back, no prob. the problem turned out to be a bad priming pump. apparently when they get old, they go bad, fastlane overnited me a pump, solved the problem immediately.

One of the critical issues in running wvo is filtration, make sure you're doing that well also. When i started, i didn't do that well, and it created problems that cleared up when i got that right.

not sure about the shutting off when your diesel tank runs dry, this may be a stupid question, but are you sure you're running wvo?

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84 300 D Turbo, 222,000 and rolling, veggie most of the time.
91 350 SDL veggie wannabe