Need help with Greasecar problem!

I am very desperate to solve this problem. I have a Greasecar system. Here are my symptoms:
After driving on veg for about an hour, speed and acceleration drop. It continues to gradually drop until the car literally can't go anymore and stalls. Even if I switch back to diesel it acts the same way. In fact, it's WORSE! There is plenty of both fuels. Once, after resting for a while the van started up and went as if nothing happened. Also, when I switched from veg to diesel, blue smoke started coming out. I was planning a cross country trip next week. Now I'm stuck! Any ideas? Is there anyone in CT that could help me out?

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