Just read through the pirate thread again. You said the longer it sits the easier it seems to try to start, and that only the front 4 cyl seem to be firing. That sounds like you aren't getting enough fuel. Have you checked for vacume leaks? From what I understand a propane system works on pressure from the tank, and vacume from the motor. If the tank is full it has pressure. If there is a leak it might not have enough vacume to open the lock off valve all the way, or even open the diaphram in the mixer.
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